Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f22ddcd67ed5f3a…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6980baca05a2d203f2247a06a6f6d6 SHA-1: 48b881d2c073211d745fda5d239c6df337e557a6 SHA-256: 1f22ddcd67ed5f3a0fac5ffaf442343098320463e9aa693d5060743d81e9aada
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body text, though partially obfuscated, includes the malicious URL, suggesting a lure to external malicious content. The primary attack pattern involves leveraging a link farm to distribute 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=elektrik+%25C3%25A7arpmalar%25C4%25B1+pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • http://files.fmbcyubacity.com/uploads/1/3/0/7/130776403/988876.pdf
    • http://files.josephsivilli.com/uploads/1/3/1/4/131411596/sofenosewudiz-nilizimawop-mavesi.pdf
    • http://jeteg.starsmeritclasses.com/uploads/1/3/1/0/131071157/7602975.pdf
    • http://files.gelhausdentalclinic.com/uploads/1/3/2/6/132680890/newevo_kevipaxagosex_gosegifinuxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/43221167188.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/zettili_quantum_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/33251252298.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/26444529917.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/63373710839.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/85855161484.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/kapebebesebedutudov.pdf
    • https://cdn.shopify.com/s/files/1/0449/3859/2424/files/anemias_hemoliticas_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/rubirekidelaf.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_off00005de4.bin
fd7bc19c4ead1ed42f7bb6c91b808d7140cae66d718e2c94fcdc2472b95c66af
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE4 5244 bytes
font_01_sfnt_off00006fb6.bin
d868a28abba39275978e77d79aff984d6968ade41484e02237285185ea11334b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 17768 bytes