Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80d5d5e70aa33a6…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 06:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12153cfc26b1c1a3a9dac844c14f9920 SHA-1: a2a29f0077272700d927f47d2f4fd893ccfccba6 SHA-256: b80d5d5e70aa33a6e4644b583165df6f78a2a8c9999d4732c526389ff44dfae5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.com). Many other links point to PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious campaign.

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=functional+groups+of+organic+compounds+pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.pdf
    • http://vetovonug.catmichaelswriter.com/uploads/1/3/0/7/130738950/buruvulololisusi.pdf
    • http://files.cjsouthworth.net/uploads/1/3/0/9/130969695/gegugarekuja.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/75762870383.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/69072486184.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/29868166779.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/adjetivos_en_ingles_comparativos_y_superlativos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/12412953667.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/tezoxorufojuburovafozav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/22875169633.pdf
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/99922816658.pdf
    • https://cdn.shopify.com/s/files/1/0448/4559/6834/files/27044612785.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/kedufesofunosivumiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/98970090429.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_off00006ead.bin
8d8edf5cbb7b8e0d321cb1200f98634de98df669010e6ab0bbb4447bc65ce87f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 5432 bytes
font_01_sfnt_off00008107.bin
c7c9ca4b7232b81488aac4f1875b1c5e6adc9a226f9e2849c2f17e0d231f6dff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8107 10304 bytes