Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731630c265f5a66…

MALICIOUS

PDF

109.1 KB Created: 2020-08-14 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e477d6838294fd14094b9dfa8d26cd04 SHA-1: ba351859d999eda740d6f18f6e24e79cc457862b SHA-256: c731630c265f5a66f2394efb8ded7cf596226244094c15811f9e7b6130022733
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised as an academic resource. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=clat+2014+question+paper+and+answer+key
    • http://files.shopdomesticity.com/uploads/1/3/2/6/132695543/zakuvawon.pdf
    • http://files.acceptlease.com/uploads/1/3/0/7/130739962/fifasorak_tolemunajixivaj_mapijolufuwo_kubiviwefux.pdf
    • http://files.lechevalsporthorses.com/uploads/1/3/0/9/130969075/nefojevuluf.pdf
    • http://files.ancientpromise.org/uploads/1/3/0/7/130739567/e3245.pdf
    • http://files.apafrancis.com/uploads/1/3/1/8/131857120/rotuvutukonevij.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/dutinutoveruzej.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8557/files/physics_formula_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/99863824909.pdf
    • https://cdn.shopify.com/s/files/1/0435/8563/4463/files/fifiluwovowixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4069/files/bakopemafebiboka.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/xebojuluvoxuwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/26926001896.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/94505682039.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/83864638524.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0591/files/ruduboxinan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9567/0427/files/b_pharmacy_syllabus_1st_year_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/77618828999.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_off00016564.bin
a93e4e067cb17ebf4d1326c8799c930c2879296e310126a1bf40f11d3bca8d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16564 5656 bytes
font_01_sfnt_off000178d5.bin
49b29aef4f03215d7ceffb788ec48483f54a7caf35dacf2843e5c7ce1c53795e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178D5 14708 bytes

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