Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1792078da80ce…

MALICIOUS

PDF

53.2 KB Created: 2020-08-08 07:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e994bd94a5140ca44ac74359e8008817 SHA-1: 7549da8671c2c0e1bb3e3c91994e02a3e45f67c0 SHA-256: f1b1792078da80ce529036c20227b63067bdb53339a20bd2025f460b7fca99ea
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, designed to appear as educational resources. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', suggesting a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the document body and heuristics indicate a link-farming and redirection attack pattern.

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=year+5+spelling+activities+pdf
    • http://files.saurabhsinghonline.com/uploads/1/3/1/0/131071151/lijira-kuxebavivaguwi-fajiv.pdf
    • http://files.sweet-greetings.com/uploads/1/3/1/3/131384070/bemivenurixomumuburi.pdf
    • http://bifoj.courtneytezeno.com/uploads/1/3/1/4/131453133/rokudekavuw.pdf
    • http://files.iam4spiritmechanics.com/uploads/1/3/2/6/132681295/dd9a688d8ba1aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/wadekuresix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/26949432909.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/71545759518.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/form_n-_445.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/kepugakenazapuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/34606266401.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/lugamufumakuvifose.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/pa_schedule_sp.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/76126541188.pdf
    • https://cdn.shopify.com/s/files/1/0435/0869/5200/files/pixaxinujuvakopiwetuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/pewogululazewejoteliw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f4.bin
68032a420e4a13d6e11cb9af8c4326406a16df729921b020c63c9bf8f5102b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 6740 bytes
font_01_sfnt_off000073c9.bin
fcdc6798cde152d68a85c664b40a55428929cde7e9cd11ace2ed7497da7a6ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C9 5468 bytes
font_02_sfnt_off00008681.bin
48d7bd704a3ccec1f227b8836bf02203e1d91a4bf8b98dffc714dc12459f38e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 13668 bytes
font_03_sfnt_off0000b137.bin
085576db18bb0fc782250241abecc7e2760275121a9b893a05600fa9329c440f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB137 16328 bytes

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