Malicious PDF — malware analysis report

Static analysis result for SHA-256 c995a1756b5f29a8…

MALICIOUS

PDF

50.0 KB Created: 2020-08-05 09:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13229d1d3ae118af23ad9bb06ae43a28 SHA-1: 8f406b7f8acbecd5a38b9f448b60cbffe6b80351 SHA-256: c995a1756b5f29a8b5b66875e1daa905cf7ec344a7a74abf132dce5ad4d37d91
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to a report and the redirector URL, suggesting a lure to a phishing or malware site. The presence of numerous Shopify links, while some are benign, indicates a link farm strategy to obscure the malicious 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.cc/pify?keyword=bringing+them+home+report+pdf
    • http://files.leahmcintyrejewelry.com/uploads/1/3/2/6/132681880/gavepapipesixinib.pdf
    • http://files.tattookelowna.ca/uploads/1/3/2/7/132741020/poxiroxogarelog.pdf
    • http://files.kelseygallant.com/uploads/1/3/1/3/131383823/9874079.pdf
    • http://bibatoka.trinaeliza.com/uploads/1/3/2/7/132741099/bevudaxugi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/fowopoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/88692069105.pdf
    • https://cdn.shopify.com/s/files/1/0430/5803/6889/files/36462552357.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/57032835774.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/15390883110.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4143/files/32296492059.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/7542627536.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/60335579695.pdf
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/waxapezeromigemowuwuxup.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/50182479460.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/wow_small_furry_paw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/tizit.pdf
    • https://cdn.shopify.com/s/files/1/0430/5305/6149/files/puxugidebapo.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_off0000874f.bin
89eadb00584f6bd932d99816d83f3c24346891b0f3611a5080a9e9cab16acbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874F 5084 bytes
font_01_sfnt_off00009878.bin
35959d6a1ea36eaab969205fd68c68e8231c202867a4257ce494368044f44ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9878 10140 bytes

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