Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1db604f985303b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 09:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf87955bc371016c5c335fdf3f4b573 SHA-1: fd64ecb3c35e3707a163de9ec55f45997bd41619 SHA-256: 1a1db604f985303b9bde175ff5edce57114fb16519edecf771fcf96480c29061
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link farm designed to host numerous PDFs. The primary redirector URL is https://ttraff.ru/wb?keyword=peugeot%20407%20repair%20manual%20free%20download, which is part of a larger SEO link farm strategy. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for linking to known malicious redirectors.

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/wb?keyword=peugeot%20407%20repair%20manual%20free%20download
    • http://files.sarahconstable.com/uploads/1/3/0/9/130969418/wolumajibijakapapu.pdf
    • http://jabatogim.vespawanderers.com/uploads/1/3/1/1/131164250/rifubavewixovejek.pdf
    • http://files.michelleyounghares.co.uk/uploads/1/3/1/3/131378780/531899.pdf
    • http://jabaz.istarjoies.com/uploads/1/3/1/1/131164239/6828346.pdf
    • http://files.lovelydaypittsburgh.com/uploads/1/3/0/7/130740231/nibitekapud_duvuvepugala_xifamuputodebi.pdf
    • http://jabatogim
    • https://cdn.shopify.com/s/files/1/0429/3600/8871/files/53717064844.pdf
    • https://cdn.shopify.com/s/files/1/0435/2793/0011/files/pewupomokisexolob.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/65199261466.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/89310018213.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/70682746831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/before_i_fall_screenplay.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/88411962823.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/vupedapofuvagenepedaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/fatupajoduwonuluvuraniw.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_off0000645b.bin
b8aec25d4cef8f151b48a5b45d9b301fced7c6b4cb3ca515bc59cdbe2cdb911e
pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 5588 bytes
font_01_sfnt_off00007760.bin
535da0985f38485b08397c5227555b4f83f003dacbbd1c35039c987d0c3ee20f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7760 10056 bytes