Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1c807c16f6246…

MALICIOUS

PDF

45.2 KB Created: 2020-08-13 22:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2494c906a589cddb66d26278566ce0 SHA-1: b684a15e9bde2dc920c1ea3c73753d496b494966 SHA-256: f3b1c807c16f62466faa639e8a22de94840cb82c79406b2a5c808d663c21b3c0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a workbook answer key. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a link farm or redirection scheme designed to lead users to malicious content, likely for further exploitation or credential harvesting.

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.com/pify?keyword=genki+workbook+answer+key
    • http://sofozebol.anneduffforeducation.com/uploads/1/3/1/0/131070493/wavepimakoxida_bevofinu_gadulegujab.pdf
    • http://ligenikur.sdautismhelp.com/uploads/1/3/0/8/130874284/565fa118a5cd0.pdf
    • http://xilap.capitalstringing.com/uploads/1/3/1/0/131071021/5324673.pdf
    • http://files.mcoreproject.com/uploads/1/3/0/8/130874050/baxopogodilujov.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/begum_rokeya_biography.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/4025581907.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/78662446151.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/tazebamev.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/17077706664.pdf
    • https://cdn.shopify.com/s/files/1/0431/6738/3712/files/financial_appraisal_methods.pdf
    • https://cdn.shopify.com/s/files/1/0431/0823/7473/files/esl_upper_intermediate_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/139753367.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/6627938419.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/4327830797.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/82413995586.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/15924440662.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659b.bin
9d40b8246d43f148bb65185600c8847c409a87d1a3d6463893ddd1752a3a19ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 3336 bytes
font_01_sfnt_off00007188.bin
c9d66609e5ef1b27777557aa0d79fb6e5fd3fed6498af6e04743226ea140e15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 5076 bytes
font_02_sfnt_off000082f5.bin
adf111101abeb653f044dbdba3c9b928c88f8463336092f04bae0817e9d89fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F5 10784 bytes

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