Malicious PDF — malware analysis report

Static analysis result for SHA-256 042fbb65e5cc3f34…

MALICIOUS

PDF

36.5 KB Created: 2020-08-29 11:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4addb73fe85ee20bb87a94af5ad246dc SHA-1: 6320ba2aec3ecceda16355050727bd4c81938b48 SHA-256: 042fbb65e5cc3f348ed3e70019b01afe8ef1929ca66dab31b86cd8c5028e5cb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lead 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.cc/wix?keyword=the+not+so+boring+minuet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/17067642322.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8823/files/factores_bioticos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/6789944451.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/mh_cet_law_2020_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/xelijiwinezusij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/fuwirazoxowivuxonipidob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/kuala_lumpur_food_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/47831050273.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/understanding_psychology_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/advanced_lock_picking_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/nike_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/76566781052.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/72242684116.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/how_to_use_newtone.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/68433371361.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/calendar_2019_december.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_off000053ae.bin
ef71d4479b14c2fbe3fa89ca8a449915e755dea1d9dd2d306a84a185f61dca23
pdf-font-stream PDF embedded font (sfnt) at offset 0x53AE 4948 bytes
font_01_sfnt_off0000645a.bin
b6d85a38635d18621acb7c45af3946f5794df0bacba464ba52730ad6431bd5ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 9652 bytes