Malicious PDF — malware analysis report

Static analysis result for SHA-256 15760f27fbabd24f…

MALICIOUS

PDF

50.5 KB Created: 2020-08-08 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118e568d55fdc2a02b5d0dc9868fbcb5 SHA-1: ed1a1486ad060c2ba6a44b386d471754d109353c SHA-256: 15760f27fbabd24f95d3d51db1b4cd8b2304d92aca0d03f23c26c763f36d1a99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=broncho+vaxom+3+5mg+bula+pdf as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=broncho+vaxom+3+5mg+bula+pdf
    • http://sidumije.silverfernevents.com/uploads/1/3/1/4/131454065/4129730.pdf
    • http://files.amandaetchison.com/uploads/1/3/0/7/130775310/sujum.pdf
    • http://files.ppischoolpics.com/uploads/1/3/0/7/130775014/5345076.pdf
    • http://files.bkengineeringconsultancy.com/uploads/1/3/2/6/132681033/gurizusafizek.pdf
    • http://files.beautyclinicohio.com/uploads/1/3/1/4/131483336/lumexuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7797/5712/files/akuntansi_dasar_smk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/dalenikakez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/safukawozavujetokudivoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/fumenav.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/14539676700.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/mevata.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/fejidaxid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4847/files/kipoxemurapobodazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/19162133429.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/60049451895.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/bodybuilding_steroids_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/36115097082.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_off000083e2.bin
225447a55f2f07b0bff105f5d076b2b2103a7768f7f8c23d969163689aa90ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 5996 bytes
font_01_sfnt_off00009833.bin
6652f08e68fa8b322ca5ff28214d23bd30f313266e61ffc367a67f3b8fa469dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9833 11068 bytes

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