Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8107515b77988…

MALICIOUS

PDF

41.1 KB Created: 2020-08-17 10:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 051cf6ed92238b77ddb6c7be4152c15b SHA-1: a4013e4ba51d15ccaf631ef41ae7ce0e7615ac4b SHA-256: 1aa8107515b7798853392b243e501ea4560a66bb786c512e01ac4b392e91376c
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=adverb+placement+exercises+pdf', suggesting a lure to a site distributing malicious content. The presence of a link farm and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted from this sample.

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=adverb+placement+exercises+pdf In PDF document text
    • http://files.cutofnova.org/uploads/1/3/1/3/131379761/xegukuwusak_fepivavamere_wasajisive.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/1/0431/0528/8349/files/wakaxukixedunibiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3823/4008/files/12379664864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/mexewefemalas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/a_alphabet_wallpaper_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/godsfall_world_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/bloodborne_pathogens_exposure_control_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/hillsong_united_songs_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/jepovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0794/9475/files/nagudelubidagidib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/53202310777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/gevoxadogisopepesabizak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/74259682432.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 4

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_off000062ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5560 bytes
SHA-256: 1e025acd1415b0164c984c7b560a883c9547d2cb7a0a6c3fd650bbed854b6f8b
font_01_sfnt_off00007588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10100 bytes
SHA-256: 008dc93b56ea6c399f201d1850aa4213d7b210ed481edd57cc88c7c024f72e63

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