Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7cfd22e1e94e18…

MALICIOUS

PDF

48.2 KB Created: 2020-08-02 21:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0139d4c85aed5e23fee4258ba09801 SHA-1: 9bb6aeae12b7850222d376b20551dd003bb53043 SHA-256: cd7cfd22e1e94e18f230094403bc8c3886f6de1dc0445c0b1cf0c32b0b403942
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier also 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.ru/pify?keyword=wow+classic+warrior+bis
    • http://files.doitforthemems.com/uploads/1/3/1/3/131380596/jisixaxuka-pakagewopeguki-ruzisigewaget.pdf
    • http://files.stuffyourfaith.com/uploads/1/3/0/7/130739362/6057853.pdf
    • http://zefoweju.sgaquatics.com/uploads/1/3/1/3/131380107/jewejizefomomerorume.pdf
    • http://files.ksweducationalconcepts.com/uploads/1/3/0/8/130874422/5512879.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/86083434247.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/kujadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/88147525503.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/bafojatupud.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/nusewom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/vipufonil.pdf
    • https://cdn.shopify.com/s/files/1/0440/7748/2136/files/texas_durable_power_of_attorney.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/72158416331.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/90898966599.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/94775671483.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/kagilew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/jalifazozetoramo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4002/9344/files/46267997831.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_off000075de.bin
4da84614f98b064fe672c7715857d96fd71560a697d792eb366a040b0de960f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x75DE 5036 bytes
font_01_sfnt_off00008727.bin
e6b82b338abf48c8959e54c6350940dc7843348a9241dd612e4fda0862396a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8727 14272 bytes