Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6b373528c0e2d3…

MALICIOUS

PDF

40.8 KB Created: 2020-08-07 22:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ea51a07cf972fe40382f53f7d179bc SHA-1: 56521022e28aa3b3a43030c5c07c7ebb020de52d SHA-256: 5a6b373528c0e2d35babb5616bb64b7f47a0c994da02a5d634d7a922e2462fb9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify URLs, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to PDF conversion and the malicious URL, suggesting a lure for users seeking to convert files. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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=convert+pdf+file+to+word+doc+free+online
    • http://files.spauldinglibrary.org/uploads/1/3/1/4/131406518/1441329.pdf
    • http://files.pavilionrecoveryhouse.org/uploads/1/3/1/4/131413550/2327980.pdf
    • http://gavako.sallyjaneheit.com/uploads/1/3/1/4/131453540/0b3526c0abaea87.pdf
    • http://files.neoyouthelite.com/uploads/1/3/1/8/131857334/9684656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/biblioteca_de_alejandria_libros.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/munemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/zimuponobakujumala.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/84020114553.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/nemovelid.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/65063490080.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/32844881521.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/fatotifudobobanofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/41598909674.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/42763092270.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/esquema_corporal_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0441/2522/5112/files/83400687305.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/mivinidapogitolid.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_off000062c4.bin
a514768c2a8a63084e861fbc185407d81bac568383eecb9a8b84d62eef2c6e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 4816 bytes
font_01_sfnt_off00007351.bin
6cd6bb1a5b5813e5cb8ee9904e704a5bd77805cb107dec40b794cf300c4f4bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 10200 bytes

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