Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b2f3db31626cc…

MALICIOUS

PDF

55.7 KB Created: 2020-08-14 09:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185ec5e933b7e053afa83f9850250650 SHA-1: 5417dc8d102aea1c2145c91e0432aaf8b71e87a8 SHA-256: 879b2f3db31626cc4c5ff1e6bee8886c00a91058835383f5875ed994d2601d7a
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for "Ganpati aarti sangrah in marathi pdf", suggesting a social engineering pretext. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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/wb?keyword=ganpati%20aarti%20sangrah%20in%20marathi%20pdf
    • http://files.rickyfrank.com/uploads/1/3/2/7/132712207/5656922.pdf
    • http://kojefusi.francislewisenglish.com/uploads/1/3/0/8/130814328/fejeropovigaxuxeluxe.pdf
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/sakexovoremubogi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2888/8217/files/pijabegejukagemufezowuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5974/8769/files/cardiovascular_endurance_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/pajikaxitikisuluwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/71627208022.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/miwoxut.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/2077694727.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/kaduduwopovud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/nanuwuvivitet.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/bribery_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/76834986513.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kumug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008286.bin
4efbe92cb219572a1d4050005930c6fc0c8e5cc66caf60c2ac221743478ffa74
pdf-font-stream PDF embedded font (sfnt) at offset 0x8286 5452 bytes
font_01_sfnt_off000094e9.bin
71d058ee4e33bf79194b66d51c691bdbbd67f907a7dbc9b32dd3ddf365c2369f
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E9 14356 bytes
font_02_sfnt_off0000c288.bin
c4989b6f7fc12ca7f4419fac83a05825321dbbb31e5ef9094980217b213b2793
pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 3244 bytes