Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b19e34a9fec594…

MALICIOUS

PDF

49.7 KB Created: 2020-08-10 19:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212df0e1137dc68e579a2faf1259ed52 SHA-1: 1f1e73df45044da7a77f5e3cec07fd4a9ec6fdf7 SHA-256: f9b19e34a9fec594884f88ddc1841885fbb5067d43ef0e1c5520bf3946082da3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to `ttraff.com`, a known malicious redirector. The document body, though obfuscated, contains the text 'Mba entrepreneurship lecture notes pdf' and the malicious URL, suggesting a lure to trick users into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=mba+entrepreneurship+lecture+notes+pdf
    • http://xiwuleji.courtneyrenees.com/uploads/1/3/2/3/132303195/vegonaza_meketenogi.pdf
    • http://files.stjohnwc.org/uploads/1/3/1/4/131453649/90108f2ee801c.pdf
    • http://files.bestinthewestevents.com/uploads/1/3/0/7/130740138/filumatijajavad-zowuxegewiga-vazukosigina.pdf
    • http://files.fenixohjelmapalvelut.fi/uploads/1/3/0/8/130813330/18da26.pdf
    • http://files.demesstainedglass.com/uploads/1/3/0/7/130739450/de480.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/10461280119.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/fugodekotawerovegetojot.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7394/files/97200685963.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/99206677105.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/rufinulakowadavotenak.pdf
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/spring_framework_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/instantiate_as_child.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/honeywell_temperature_controller.pdf
    • https://cdn.shopify.com/s/files/1/0429/3672/9766/files/1837672091.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/84740096703.pdf
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/50070535188.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_off0000840a.bin
51d29f14862f4d5de6e47598f95a0802bffdc0d9f18af0d6c3af23f3538d9736
pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 5388 bytes
font_01_sfnt_off0000964c.bin
389e98d688604ed0951b8a41098267eb32df2205bb160108a53049ac4699db58
pdf-font-stream PDF embedded font (sfnt) at offset 0x964C 10376 bytes