Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8353ee3dcf1a18…

MALICIOUS

PDF

54.6 KB Created: 2020-07-28 21:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ded7e03a00f7d83d72ea75643c3c43 SHA-1: 6d1ff4d398e0077de8e862a8f0ec2d53f782ac43 SHA-256: da8353ee3dcf1a188faa67bfb46453a7f17a6f5492006446f8e8fad2262461a7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery or execution.

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=email+etiquette+for+students+pdf
    • http://files.fusionartgallery.net/uploads/1/3/0/7/130775063/4545451.pdf
    • http://files.newhavenbooksellers.com/uploads/1/3/0/9/130968984/8783756.pdf
    • http://files.bdgapparel.com/uploads/1/3/2/7/132740763/tiviwupusulu.pdf
    • http://files.missionpeakrobotics.com/uploads/1/3/1/3/131383319/c8a85ba5.pdf
    • http://files.inniscarraparish.com/uploads/1/3/1/1/131164425/7ca76db.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1308/files/larejufeviraw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/wimaxolusogumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/69358862698.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/novivajogataradejajoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/6159/2742/files/38711403810.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/89831839027.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/derisunonasubelovokipuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/nolenazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/79334205535.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/72949391754.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/29637976207.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/xulutesofitaju.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_off0000819f.bin
39d01ccd28538d058909283e1ed06edffccc17959ea119c21367da1572ec2f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 5152 bytes
font_01_sfnt_off00009303.bin
c4c354bd5936dd7089f611d00b17b2d067533186f31d4a6fc45b3d8beff9fdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9303 10404 bytes
font_02_sfnt_off0000b6ce.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 16204 bytes

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