Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa823883cc1724c…

MALICIOUS

PDF

55.0 KB Created: 2020-08-11 14:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ea5ab64699d09b416e7f8994356304f7 SHA-1: 96a0bb1a7733d7b2d0bafac7e156303bc1752177 SHA-256: 0aa823883cc1724ca10a47d7fb389a02b29c440a74ec0a30813c4f01e0a3167c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself contains the primary malicious URL, suggesting a phishing or scam attempt to trick users into downloading further malware or visiting malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=cerfa+02+pdf In PDF document text
    • http://files.downriverkaraokeanddj.com/uploads/1/3/1/6/131606876/bdd09559b60a130.pdfIn PDF document text
    • http://files.destined2wed.voyagerwebsites.com/uploads/1/3/0/7/130775009/gugewixuzi.pdfIn PDF document text
    • http://files.hopecm.org/uploads/1/3/1/8/131856257/c8d89b9a.pdfIn PDF document text
    • http://files.scottrobesoncustomwood.com/uploads/1/3/2/6/132695596/13ef5581e7b94.pdfIn PDF document text
    • http://files.wstudio516.com/uploads/1/3/2/6/132681836/796d1323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7583/6835/files/introduction_to_structural_dynamics_and_aeroelasticity_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/immunisation_schedule_qld_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/vemivarixadifenob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/38511413957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7550/8126/files/converter_to_word_online_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/lexitolemepol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/48653937936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/6562282351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/cessna_172_weight_and_balance_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7607/5164/files/12059171198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/circulatory_system_worksheet_grade_5.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D5 5004 bytes
SHA-256: c8b182b60023e312c85afbc5701e1691fda7f1eaae6943916883a3d21c91f3b9
font_01_sfnt_off000086dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DD 2464 bytes
SHA-256: a4819ace0c68aea95bbe756288e19462c7f99d9feecd8c208b1fc591cd21e6da
font_02_sfnt_off000091b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B9 11888 bytes
SHA-256: 0814f05e47875de1c21d8e24b664f6b83dfd82d83d4170e7b33d0427bfa0d3b0
font_03_sfnt_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0