Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6150c48cbf26b5b…

MALICIOUS

PDF

65.9 KB Created: 2020-07-25 10:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233490413595c1b2e9d1020046365115 SHA-1: cdbb8d76359c242197dcc7796aaf609764dd5baf SHA-256: b6150c48cbf26b5b3db3d03b057666a658aa322dc1466e6fc9b5fb1e366ae267
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'selfish gene theory pdf'. The presence of numerous Shopify-hosted PDF links indicates a link farm strategy to improve search engine ranking and distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=selfish%20gene%20theory%20pdf
    • http://files.inverparish.com/uploads/1/3/1/4/131406659/torufad.pdf
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdf
    • http://files.nyacuchiro.com/uploads/1/3/2/6/132680874/d46b5.pdf
    • http://files.rachelbeyerdds.com/uploads/1/3/2/6/132681359/gimosadanunefadapog.pdf
    • http://files.brlfmc-music.org/uploads/1/3/2/8/132814337/41389f0a9b.pdf
    • http://files.inverparish.com/uploads/1/3/1/4/131406659
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/futuxuminipewaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/26422649328.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/52559202053.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/36179246140.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/40614781731.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/33094717015.pdf
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/65555748274.pdf
    • https://cdn.shopify.com/s/files/1/0429/4210/3719/files/86935839277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/dixuvumatodojolexobapunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/wagunibito.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/32734842309.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/kukapigitagozekej.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/14777031166.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/tojujupal.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_off0000c0b7.bin
bb7479eda20d813b4a2c116ffa63df169be0079f4b2c0cc090e8830035fc0421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 5084 bytes
font_01_sfnt_off0000d1fc.bin
fe5a5d8af5bd2e416ace63b9e94d1538c056803621bb8915e735be286e31e593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 12468 bytes

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