Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ff394ec99ade11…

MALICIOUS

PDF

39.2 KB Created: 2020-08-25 22:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5bc68c6f8eedbfef9e18f217eef214 SHA-1: 3b13e23326cd44ed92fde8aba1fd74bb3e6dcb85 SHA-256: 44ff394ec99ade118d200bedc1f4320d6a671295945ff72b0672b61cfb00a572
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains the same redirector URL and numerous links to Shopify-hosted PDFs, suggesting a link farm or content distribution for a scam. 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=mvc+controller+return+same+view
    • http://files.jebelalicatechists.com/uploads/1/3/1/4/131409055/fivabiwi-mekowevojupobi-resowelavomiwe.pdf
    • http://lawam.bssmfg.com/uploads/1/3/0/8/130873951/semafuvozud.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/nuts_card_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/51188584906.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/official_zaytoven_drum_kit_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/81049006127.pdf
    • https://cdn.shopify.com/s/files/1/0437/2280/1306/files/nifome.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/wapomab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/26362713499.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/bunoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/best_book_for_learning_english_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/96242915670.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/aurangabad_times_urdu_news_paper_today.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/colorlib_templates_wordpress.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_off0000546b.bin
cfc8f221f10c5c5adcf357a57d318c14613be845784aedd2ea92e8994f08408b
pdf-font-stream PDF embedded font (sfnt) at offset 0x546B 5104 bytes
font_01_sfnt_off000065c5.bin
1254e5d632be9cf2fc1e1bd29fd028bad19996f93154ebe1194cd9b99a0e22c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 13100 bytes