Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be1e83e7d3cb683…

MALICIOUS

PDF

40.1 KB Created: 2020-07-28 12:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e5eaada9ac83f4dc04b146fe8c062b SHA-1: 58db2ce4da2435a6e1c76e765eeac8b26330dd92 SHA-256: 9be1e83e7d3cb683c33dc7b6b441ad925f4d492bc15daf3e44a4e9bb6fe80be2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure via the URL https://ttraff.ru/pify?keyword=airtel+kyc+form+filling. Additionally, PDF_SEO_LINK_FARM indicates a mass external PDF link farm, with the first URL being https://cdn.shopify.com/s/files/1/0429/2942/2499/files/gipugavarekedazi.pdf. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'Airtel kyc form filling'.

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/pify?keyword=airtel+kyc+form+filling
    • http://files.bfmimpactcenter.com/uploads/1/3/2/7/132740445/123be.pdf
    • http://files.tangiblegreen.net/uploads/1/3/1/3/131380777/porotiled.pdf
    • http://files.nvhsessence.org/uploads/1/3/1/6/131637308/marujore.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/gipugavarekedazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7429/files/zawokaxasirasorezadoziko.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/59606472524.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/fudatimagewudixadaremev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/dabagebumodijixeluf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/wakutijupalulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/vulalokulosalosipoturedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/weribowagujaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/64395272308.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/jalatuvinunawifebutim.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3464/files/fujobojagunujoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/topejoniro.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/vesivujefenokedajo.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_off000060fc.bin
7fd3caeea2c4ae206b78fd831398d9e4b28e7030009d4f498536de86c10dfd2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 4756 bytes
font_01_sfnt_off00007113.bin
d57b89bea4417caa922403278426aae29292963bee5eac499566c9b8a0c94234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 10040 bytes

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