Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4712eff6873e316…

MALICIOUS

PDF

43.4 KB Created: 2020-07-30 18:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce6d9b7bbf742b99f5cffaf80c8ab3dd SHA-1: 2ca11ec67ecdcbd284823b8d052fdf737dce7a44 SHA-256: d4712eff6873e316c30d10833fab6d8e97b7346557804d8d1dc8205f18eead5f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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=capacity+building+proposal+pdf
    • http://files.awakenteenleadership.net/uploads/1/3/0/9/130969923/9379379.pdf
    • http://files.highergearcoaching.com/uploads/1/3/2/6/132682030/9895675.pdf
    • http://files.williamstreetcoc.com/uploads/1/3/0/9/130969485/wipegu-mibuv-jukumiginir.pdf
    • http://files.kriswiltse.com/uploads/1/3/1/6/131606248/7043701.pdf
    • http://files.payc.ca/uploads/1/3/0/8/130814227/3dbc25.pdf
    • http://files.williamstreetcoc.com/uploads/1/3/0/9/130969485/wipegu-mibuv-juku
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/gapurugitujoduzor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/6910565719.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/83887300344.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/61554376517.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/mowuzedumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/80399538924.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/zubanerif.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/69033028983.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/punekadifidamaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/99252492899.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/fubixibu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c1d.bin
d4fbb2acbcd3fb2921ef91e47eea062d5342ee52487d1ce0f6efb5e33940affb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1D 5352 bytes
font_01_sfnt_off00007e53.bin
16b8e94076ab81fca3f41cd87ca4e6f7dae7f5ce986fa922d2c4d27cf5db8f22
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 10052 bytes