Malicious PDF — malware analysis report

Static analysis result for SHA-256 923412803c838471…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 05:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc57f7efb712cbd73938912db561955 SHA-1: 3265768ac7fb257fde3bc5a01290375e19ec32a3 SHA-256: 923412803c838471e5d9cfac5d79b5c7b8cae2261954376199fdfa433c652ca2
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a redirector service, which is a common technique for distributing malware or conducting phishing attacks. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the nature of the redirector suggest an attempt to lure users to a harmful destination.

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.link/wix?keyword=ralphs+farmacia+en+coldwater+y+ventu
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/somazib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0085/files/carga_electrica_fisica.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/zuzifawezorojabitukil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3615/5809/files/46550310725.pdf
    • https://cdn.shopify.com/s/files/1/0462/4318/4794/files/sir_william_borlase_sixth_form_prospectus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2037/8524/files/dodiravivusabof.pdf
    • https://cdn.shopify.com/s/files/1/0437/5301/3409/files/34489529097.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/bibliology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3051/7672/files/rewavinosuzofikofixelok.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/vivagatadori.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/pukojukisolizagimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/76131120405.pdf
    • https://cdn.shopify.com/s/files/1/0435/5561/8977/files/gekagipejite.pdf
    • https://cdn.shopify.com/s/files/1/0437/0356/6486/files/dovogebigafalewo.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_off00004ad5.bin
3bca54294f30faafc4d5ff10cb1fdfdfc101e7d7e099f2a52ccf5ae0a72a0d6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 5656 bytes
font_01_sfnt_off00005e01.bin
01b712d253aa2116fc86cdba3a131d26bdd0660e2a448318f72bf60f6490ef6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 10428 bytes