Malicious PDF — malware analysis report

Static analysis result for SHA-256 d876563b85811bf6…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 17:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4fc2533e0cd96afcbfef7979d997aa1 SHA-1: d7ba7a53a4546a7d762ce5f481f6e30a49846fa9 SHA-256: d876563b85811bf6b04c209851eea5a864c28d1e58a63326a84fcd1b7a0d9f5e
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to malicious infrastructure via these links.

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/wix?keyword=que+es+la+geometria+del+espacio
    • https://cdn.shopify.com/s/files/1/0462/3902/3253/files/surf_fishing_report_south_shore_long_island.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/focus_group_guide_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/sotivaxolixunekobadeki.pdf
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/72198746991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/noliwapalare.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/tezikuxukaditof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/jajavuvetuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/9440132299.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/68396095593.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/rizipoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/miwaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/8257/9110/files/59454853856.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/net_framework_setup_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/70986193734.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_off0000628c.bin
a097b99b3004f153c90045c83ba97bad5a392b302546e595e9ecc8a88c0422ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 5452 bytes
font_01_sfnt_off000074ff.bin
4772457fd84c2297c67e2acc09941eab5c2e132c7292ffaa2751dffb9a55ad88
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 11456 bytes