Malicious PDF — malware analysis report

Static analysis result for SHA-256 7334f1c1c89c69d9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 08:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59b91ecddea563a42368e5a779f24ddc SHA-1: e0263dea4ea113ef8c56530102133e15880a07ec SHA-256: 7334f1c1c89c69d98ef1d9dc0b63dd47804a0ca374d35cb749c9037786b2c3a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious URL, disguised as accounting interview questions. This indicates a phishing or social engineering attempt to redirect the user to malicious infrastructure. The presence of numerous external PDF links further suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.ru/pify?keyword=accounting+related+questions+and+answers+for+interview+pdf
    • http://jerone.samaacollection.com/uploads/1/3/0/9/130969744/1954297.pdf
    • http://fudebupij.musiccitypetpartners.net/uploads/1/3/1/4/131407178/tewatodeno_mapeb_lixesonavata.pdf
    • http://files.qutathleticsclub.com/uploads/1/3/2/7/132710783/wukegutisodobere.pdf
    • http://files.newyorkcityspeechtherapy.com/uploads/1/3/1/4/131454355/0bbefa65c7b119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/xazekenazawuditedapoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0437/5756/8151/files/the_precious_present.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/kejubanifarutusozeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/so_far_away_lyrics_avenged_sevenfold_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/gobusubevajo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/92669968312.pdf
    • https://cdn.shopify.com/s/files/1/0433/6720/2974/files/95135437708.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/22205981191.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/tizibovijotujon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000671f.bin
f80cf6de000e49bf19b959f6b08ee572bb6712dbb9feba39961ce3369c11d01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671F 5472 bytes
font_01_sfnt_off000079d1.bin
64eacaca3bcdf98150f7583d966ebc08e79918d5b532db14dfeb3b9a37fcea65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 10020 bytes
font_02_sfnt_off00009be7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE7 4324 bytes

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