Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fbd61d20b7352a…

MALICIOUS

PDF

53.0 KB Created: 2020-08-08 04:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe188074c29596df251207e8f59dabb3 SHA-1: bc8550d504526ff04d064b37125689be373af8e6 SHA-256: 72fbd61d20b7352a609bcc3b402baf52fa4b9e9c0f31b4125140f2e445239ab8
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 a redirector infrastructure. The primary link directs to 'https://ttraff.ru/pify?keyword=arithmetic+and+geometric+sequences+formulas+pdf', which is flagged as malicious. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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=arithmetic+and+geometric+sequences+formulas+pdf
    • http://files.bolstersunderway.com/uploads/1/3/1/8/131856330/simivivusuwa.pdf
    • http://files.abugslife.blog/uploads/1/3/0/8/130814258/4aa71e3aeb.pdf
    • http://files.jennifersanasie.com/uploads/1/3/0/7/130738619/13824c2201d.pdf
    • http://files.bosreunion.com/uploads/1/3/1/3/131382092/6567386.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/zobozatew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7625/files/bixixonalenusewulixo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/kifapozixegumali.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/98206600795.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/diruze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/hotel_company_profile_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/21058371639.pdf
    • https://cdn.shopify.com/s/files/1/0435/5014/6723/files/nunulo.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_off00008345.bin
4579e2e0afc125e251b906131923e347acc33345c3e4a99b1da821060f05494f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8345 5684 bytes
font_01_sfnt_off0000966c.bin
ab8650c0d8a3e7130fa4e30f3b84571c84eb7fd461871366b62e62d1a84d8947
pdf-font-stream PDF embedded font (sfnt) at offset 0x966C 15172 bytes