Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc57553e9265461…

MALICIOUS

PDF

39.6 KB Created: 2020-08-04 13:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca734f33814f7197511dbc87dfd8b9b8 SHA-1: 31f759ca6dbe39a1066d46a38d0f336940a3b6eb SHA-256: 0cc57553e9265461df14aa3328e81a7a20d4aa338175e08aa49911e4919e60da
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the redirector. No scripts were extracted, but the presence of numerous external links and the malicious redirector strongly indicate a lure for further malicious activity.

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.cc/pify?keyword=aiag+vda+fmea+handbook+2020+pdf
    • http://files.amoryshelter.com/uploads/1/3/1/0/131070231/koduripidenofiro.pdf
    • http://files.shellyginterconrad.com/uploads/1/3/1/4/131454221/6824144.pdf
    • http://files.jemendozalahc.com/uploads/1/3/1/4/131408415/nifoxujewasipuzer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/xexivuwolixomabixinunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/limopujiruzetebujuvorid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/livro_adestramento_de_ces.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/losov.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/john_deere_310_backhoe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/45917228247.pdf
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/brief_social_phobia_scale.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/pifarolavumejebim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/43943211245.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/gagari.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8263/files/85325570671.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/19520079203.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_off00005c06.bin
069405135e73910d1ec167dbf1f293a608d459b9626a004c03298397e77c2f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C06 5676 bytes
font_01_sfnt_off00006f4b.bin
1c722ed4cf2d78c473711daefd25ac9de67114b6cc2cedc5687f43be39574c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4B 9996 bytes

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