Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c9d7c2733cb1ae…

MALICIOUS

PDF

70.7 KB Created: 2020-08-11 17:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3442e5a6576cd5638f83233e3e10bd SHA-1: 65511f09609a90a7c8f8298574e19a0cbd6cf8b9 SHA-256: 62c9d7c2733cb1aec6dd8642285b8bfb885b3f647b26d95cac682a4219c3b25a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. This suggests a link farm or SEO manipulation tactic to distribute malicious content or phish users. 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.cc/pify?keyword=topographic+map+interpretation+pdf
    • http://files.americanlegionpost141.org/uploads/1/3/1/3/131379343/wezevi.pdf
    • http://jenezom.fisherlab.org/uploads/1/3/1/1/131164250/tugimefowavodimimabo.pdf
    • http://files.stillmomentsbycarmen.com/uploads/1/3/2/6/132681560/8024813.pdf
    • http://nebodebo.greyhoundstorage.com/uploads/1/3/2/7/132740214/xifirar-gumob.pdf
    • http://files.stfrancishospitalfoundation.com/uploads/1/3/1/3/131398253/nurobife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/adirondack_high_peaks_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/64839501406.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/21214198793.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/farazoxilomekejewij.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/blush_faces_of_shame.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/65792718313.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/jijefemixaxume.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/dujetewalomudezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/alphabet_phontique_international_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/acs_gen_chem_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/49931335352.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/lemoxunevigaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c224.bin
c1f521f0f1c6f466a1608ad36c76df6c5393c4c44eb54a54443203cc5b2de1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 6700 bytes
font_01_sfnt_off0000d85a.bin
4d3863cb371305dd522f89bc09c5fc0e27b10a34181381d7ed7d2a63e3f3e2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 5308 bytes
font_02_sfnt_off0000ea43.bin
b9410e0a9991271e61bea8e138ede7eb156ea991a89fdbf165f14ce3ee6174a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10352 bytes

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