Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ca1af76b24e5c8…

MALICIOUS

PDF

45.9 KB Created: 2020-08-10 14:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf30ce39223a9da4843d7be4ddf267c SHA-1: a4d02f223415d691f0cffc73b37d6e4cf6484185 SHA-256: c1ca1af76b24e5c86c66ca8e37ad477da3e954c2a9747721ec604605966f2712
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to knitting patterns. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is designed to lead users to further malicious content.

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/pify?keyword=babysocken+stricken+anleitung+pdf
    • http://files.luxaeternasolar.com/uploads/1/3/0/7/130739340/defagedozul.pdf
    • http://xuzise.innovateheadstart.com/uploads/1/3/0/7/130740178/ziwolalalikiba.pdf
    • http://vaxabo.lionhearttalent.com/uploads/1/3/0/8/130814328/77da3.pdf
    • http://beguvoxe.louiseashcroft.org/uploads/1/3/0/7/130776031/xanojowem.pdf
    • http://files.wearefocalshot.com/uploads/1/3/1/3/131378838/5002419.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1852/files/xepodofijafafitivam.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/88584981791.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/virgilio_bucoliche.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/pozunafon.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/fidikazebijupujux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/madness_project_nexus_party_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/analytic_geometry_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/saxophone_arpeggio_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/15320546916.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/lepolixifitopudisiwan.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_off00006f47.bin
6397c95b3d26893540630752b1c40156d3065724c99dd48b33da1282d14321fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 5680 bytes
font_01_sfnt_off000082a7.bin
d3492a4eb437560e551d3f2e95960f67e59eabd6db65235116cceb0e3ab29b11
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A7 11764 bytes