Malicious PDF — malware analysis report

Static analysis result for SHA-256 000691c5f67694bb…

MALICIOUS

PDF

44.7 KB Created: 2020-08-15 03:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bfc40c573a717918a578a22a30ed534 SHA-1: a329d44e332625ab00be89891552eaa91e5be59e SHA-256: 000691c5f67694bb80cbd4468f45e88aca8922df8c7f0f201c2bbc62761572ba
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though partially obfuscated, suggests a lure related to a 'compensation offer letter template' to entice users to click the malicious URL. The presence of a large number of links, many pointing to benign Shopify domains but others to unknown domains, indicates a link farm strategy to obscure the malicious destination.

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=compensation+offer+letter+template
    • http://files.capedingo.com.au/uploads/1/3/1/6/131637273/fajonexap.pdf
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdf
    • http://wegebewi.evolvepaintcolorado.com/uploads/1/3/2/8/132814930/1380628.pdf
    • http://files.peggyshobbies.com/uploads/1/3/0/7/130740177/nilosuzesu.pdf
    • http://files.andriamesselt.com/uploads/1/3/0/8/130814235/4303661.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6750/6837/files/printable_alphabet_letters_flashcards.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/porenulav.pdf
    • https://cdn.shopify.com/s/files/1/0434/1432/3356/files/lezedofon.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/67530179378.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/hallelujah_sheet_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8357/files/82995994205.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/67350459708.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1589/files/berogesutelulekebop.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/35370671356.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/memezulejisinigoremube.pdf
    • https://cdn.shopify.com/s/files/1/0432/5608/6696/files/sumoxudime.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007147.bin
c7739046ddb378c2fe970b7387c9e04cca1743f89b4573223fa1c82d0e2d95a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 4952 bytes
font_01_sfnt_off000081fd.bin
20d16dd1732da8b95e30f8b07a90cce17fd6ca4203daac7fa1e1b609b633be38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 10656 bytes

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