Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bae0a074583c9a…

MALICIOUS

PDF

43.5 KB Created: 2020-08-09 12:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4d1ffb749a86af501237d760f039be0 SHA-1: f334a966ea571a738ad2731c653495ade3a2059e SHA-256: 40bae0a074583c9a6bfc54cea4404a8e396a5a37fef1b9179dcb5e534e432687
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=keracunan+amfetamin+pdf'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the redirection attempt.

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=keracunan+amfetamin+pdf
    • http://files.lenreed.com/uploads/1/3/1/4/131453902/kijegidalitet_nakurovat_vimulij_fitisefetuzak.pdf
    • http://files.northwestbeesupply.com/uploads/1/3/2/6/132681670/1337930.pdf
    • http://files.nadiacorson.com/uploads/1/3/2/6/132680901/1557713.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/51251728794.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/1908042966.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/cadbury_worm_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/final_fantasy_xv_a_new_empire_hack.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/5_mb_to_kb.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/xukusomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/lalolizot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/avl_tree_c_github.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/gaspard_de_la_nuit_ravel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3016/files/24610629376.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/93589042582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/regrouper_plusieurs_documents_word_en_un_seul.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_off00006e8f.bin
e5ffcc9dc3bf091b8a644b64a8e67fda472891c6f0708d05a53e75aa19c1126d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 5060 bytes
font_01_sfnt_off00007fb6.bin
f5dd8608a0a518e9834e91d898d157ca45302052aa8648b050582ebb482ba06b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB6 9780 bytes