Malicious PDF — malware analysis report

Static analysis result for SHA-256 71778bdf520f9c77…

MALICIOUS

PDF

48.5 KB Created: 2020-08-14 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b317d736b55c1eff3fa85e4fe5de66e SHA-1: a6393c83ece287bc1c0527e76cc720e2e231deaa SHA-256: 71778bdf520f9c77027cfbb6a77b1eeb6523acfdc73be980c1bbfc712f617fe8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or SEO link farms. The primary malicious URL identified is https://ttraff.com/wb?keyword=error%20analysis%20and%20interlanguage%20corder%20pdf, which is flagged as a known malicious redirector. The document's structure and content suggest an attempt to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/wb?keyword=error%20analysis%20and%20interlanguage%20corder%20pdf
    • http://sediwewur.quickstitchplus.com/uploads/1/3/2/6/132682076/8474722.pdf
    • http://files.singaporemartialarts.com/uploads/1/3/1/4/131483184/60ff4.pdf
    • http://files.biancaleearts.com/uploads/1/3/1/4/131407469/xivimem.pdf
    • http://files.pamschultzgallery.com/uploads/1/3/1/3/131383384/lumatitotetud_sudut.pdf
    • http://gupuzuka.ridgelandspirits.com/uploads/1/3/1/4/131437949/jaxopawifibebi_laduru_kakigosiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxedisurerikemamezawapux.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0709/files/20979419308.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/juxibebodiposoxef.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/negative_exponents_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/90785926223.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/35537083270.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/mazatuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7501/8662/files/pearson_mastering_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/munebigolej.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/padma_shri_award_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/68086908874.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/xiruwupusawireji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa6.bin
86ab8894dc4ec97de6f8645ac11687a26598df28e489ab0b9de0a644c2624c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA6 5384 bytes
font_01_sfnt_off0000920c.bin
88bf5942db9505dbbc388ea95a78a185d53b472c3e100d675f249ad5721c825e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 10228 bytes

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