Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d240b53850fe7b…

MALICIOUS

PDF

44.9 KB Created: 2020-08-21 17:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01af88efc0d648e492a638c5b73787a9 SHA-1: 7683e0c8d4bf5605e7c0ec140a47cb39c3d89888 SHA-256: 81d240b53850fe7b59c606e023219588aa046f2cb4935e164d4027001392f660
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body, though partially corrupted, includes the target URL and references to numerous other PDF links, suggesting a link farm designed to obscure the true destination. The ML classifier 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=chevrolet+cobalt+2009+owners+manual
    • http://files.laurelmburas.com/uploads/1/3/1/1/131164321/likisived.pdf
    • http://files.allimagesonline.com/uploads/1/3/0/7/130739628/90f48ec.pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://fatov.sheilamyers.com/uploads/1/3/1/8/131856725/mavuzadupejibu-dutebep.pdf
    • http://files.slwellness.info/uploads/1/3/2/7/132712676/182ae7fa2e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/71870598135.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/51404343066.pdf
    • https://cdn.shopify.com/s/files/1/0431/6725/2641/files/wawitoziw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3506/4480/files/53813497287.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/89853832292.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/puxefodod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/kupapimakasufewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/cahier_de_charge_application_web.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/wedawomuriwopevaxekis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/93343078587.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_off00006fad.bin
ce65859a09c41ed0707c0b9dc7157ecbc07e5b92affc652eedb03b6e34514654
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAD 5668 bytes
font_01_sfnt_off000082d4.bin
52a9fa60c6245fe28a732cdbe5525c66a298a59691c4242192c47811d76da57d
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 10580 bytes