Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bbbc0d0d676fbe…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 14:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c1a209f79a48f17058e6e0eeaf97d495 SHA-1: a34f9622b0dd1db0ab0a386170f2a6da109ff19f SHA-256: d4bbbc0d0d676fbe5903a1a761bccbb6f791a26034103198cb88c00f7dd9ed4d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is used in conjunction with a lure for 'avg antivirus pro apk android'. The document body, though heavily obfuscated, also contains this URL and references to AVG Antivirus. The PDF also exhibits a link farm behavior, with numerous embedded links, many pointing to Shopify domains, likely for SEO poisoning or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=avg+antivirus+pro+apk+android In PDF document text
    • http://files.livingroomseattle.com/uploads/1/3/1/0/131070588/ab7d24660414.pdfIn PDF document text
    • http://files.forestfreshproducts.com/uploads/1/3/1/4/131453256/7664b0c984.pdfIn PDF document text
    • http://files.southmadisonunite.org/uploads/1/3/2/6/132695489/rafeturexodori-lamixogevev-pujefapiv-sufifa.pdfIn PDF document text
    • http://zugez.howtocatchanyfish.com/uploads/1/3/0/8/130813786/rupasif.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/1/0430/0088/9507/files/sojefosaxamos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/archery_king_game_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/50912726249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/17350474436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8588/1753/files/ruminant_and_non_ruminant_animals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/48656616574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/jadilafediwubepakev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/pdf_biodata_format_for_marriage_for_boy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7510/9018/files/pittsburgh_sleep_quality_index_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/acidosis_y_alcalosis_respiratoria_y_metabolica.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 5208 bytes
SHA-256: c81c3a5166486074c1e22e2abdb1b6db1ab7eadedb6708b110b80db91dbf5429
font_01_sfnt_off00008036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 10300 bytes
SHA-256: 400b8dae2975ad064195a788e1860f9347c53627e396e56384a806ed552ee4d4

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