Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b51a4565da2956…

MALICIOUS

PDF

35.5 KB Created: 2020-08-18 22:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d4d5467406dadd16c637db29083256 SHA-1: c33e01b514d27f2582deb004322ce8e32f8b1589 SHA-256: c4b51a4565da29567d8a4a311422d125e1f869f5662d9992fc335f24e07feebb
154 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, specifically pointing to 'https://ttraff.cc/pify?keyword=phone+buzzer+iphone'. This indicates a phishing or scam attempt. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign Shopify domains but are likely used to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm strategy are sufficient indicators of malicious intent.

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=phone+buzzer+iphone
    • http://wowamubap.michelleswafford.com/uploads/1/3/1/4/131453033/215fbb0a2.pdf
    • http://files.noahcode.org/uploads/1/3/0/7/130775583/6474736.pdf
    • http://files.splitrocktrickle.com/uploads/1/3/1/6/131636654/20d1b78dc484.pdf
    • http://jajul.radiographicsupplies.net/uploads/1/3/1/3/131380755/nagujeribowakumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/body_beast_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/precalculus_james_stewart_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/75960084516.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/balafuwurenuratof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/tikoge.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/humraaz_songs_pk.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/xubimakulenuduxunezoma.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/wamamofamasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0701/files/94660610257.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8229/files/xudef.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/logitech_extreme_3d_pro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/changeling_the_lost_online.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_off000050d4.bin
538710e1278e0bc38276d0da4cb55370c4af8ed424207ab2bbb94937acea16f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D4 4676 bytes
font_01_sfnt_off000060b4.bin
e0647d54209b56bddc5aab9ee9b7cf95c03539c3d7bac466998c38b13e811123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 9620 bytes

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