Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a66a841bc01956…

MALICIOUS

PDF

43.0 KB Created: 2020-08-18 13:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05f6af4a588afee1e1ab2d69371c4c70 SHA-1: b4efe8cd5447c42666e276af0dc5a931a3e0171b SHA-256: 77a66a841bc01956a54fa4a3b20a8a2c5a13bfc2af19ec8706d1a9bc95ce53fe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector infrastructure, suggesting a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

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=android+app+development+company+near+me
    • http://nigajix.mathiasmarketing.com/uploads/1/3/2/3/132303382/lefarojevid.pdf
    • http://tijiraxo.positivelyobedientcanines.com/uploads/1/3/0/8/130814328/tazidewadinaxu_nesojiruvab_tibomux_nopopilopak.pdf
    • http://files.vastcomtech.com/uploads/1/3/2/8/132814355/83bab572893339.pdf
    • http://files.strongmansmennonitefurniture.com/uploads/1/3/0/8/130814636/8303728.pdf
    • http://files.landandairphotoworks.com/uploads/1/3/2/6/132680922/c1d796ed15b864b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/azoospermia_no_obstrutiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/nodofamadiwewijogimade.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/xewapedifawisiruzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/vagipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/91155284840.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/97240066503.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/49053234596.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/76241363846.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/anthroposophy_in_everyday_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/jebabozewapuxogogojewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/rilebogaperugoponavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/39208850750.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_off0000699b.bin
dea7e9e0212787dc906db69e42a2d4da183cd5ff14b2225944d844ff285fbdf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 5192 bytes
font_01_sfnt_off00007b34.bin
98faf3a0754f336142d7f5a25fa7eb7672b613780ed49c7e8c898657d36809e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B34 10360 bytes

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