Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8fb67e04762161…

MALICIOUS

PDF

50.6 KB Created: 2020-08-18 21:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010ef55dfb28a4cfabc970d37ff5d181 SHA-1: b5728fe8fb7c18c43475d12723009abf6dd98f2d SHA-256: 5d8fb67e047621619331e712bf967dd98bd2918898ec2ec220f5dcea8e32edb5
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 of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=android+x86+iso+6.+0', is flagged as a known malicious redirector. The document body is heavily obfuscated but contains the same redirector URL, suggesting the primary goal is to redirect users to malicious infrastructure.

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=android+x86+iso+6.+0
    • http://files.shopcustomaddicts.com/uploads/1/3/1/4/131453623/weremelivo.pdf
    • http://files.redbarnfarmboers.com/uploads/1/3/1/4/131409574/12a3dcfd47.pdf
    • http://files.empressreadings.com/uploads/1/3/1/6/131636872/64377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/43463801296.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/46010879104.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/bloxorz_level_33.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/nebomukinivaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7102/8896/files/17315651032.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/bikusapemutedimilejunip.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/xaxopek.pdf
    • https://cdn.shopify.com/s/files/1/0437/8463/4530/files/62559133018.pdf
    • https://cdn.shopify.com/s/files/1/0428/8449/7575/files/op_amp_ic_741.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/34617009886.pdf
    • https://cdn.shopify.com/s/files/1/0433/8378/3575/files/tebakigawad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/34138065601.pdf
    • https://cdn.shopify.com/s/files/1/0446/9719/0556/files/doterra_probiotic.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_off000087cf.bin
b74711224a6796e156a28bb8c88078827e5736cae3252e60fe960b016ddc7651
pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 5156 bytes
font_01_sfnt_off0000996a.bin
472f33963938cc9ba9827da34ac7c49652724219150fb9e92632828fd814af3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x996A 10552 bytes