Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33b67f306cd41c8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-03 10:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3e50f8570c0d46f9200e86b69d3eca SHA-1: 475aa44ef90563e72cac6de7997f34757d02582a SHA-256: d33b67f306cd41c84289c30e1d9cd9c4dcee9c7028b6e2f95f8227ec1a489a34
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious URL being a redirector. The document body, though heavily obfuscated, contains the text 'Red sox schedule pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

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/pify?keyword=red+sox+schedule+pdf
    • http://files.shoproot31.com/uploads/1/3/1/4/131406659/zelovefatugofap_bagunazaxewo.pdf
    • http://files.chilhowiecc.com/uploads/1/3/1/6/131606262/juxanuzazow-sewubugeruxedi-givotokule.pdf
    • http://bowup.socalsaddlery.com/uploads/1/3/0/7/130775734/f8a5f2bc714163.pdf
    • http://zuzozex.beingwithcounsellinglondon.com/uploads/1/3/0/7/130740013/6473323.pdf
    • http://files.shirehistory.org/uploads/1/3/0/8/130814070/ae90b43c114615.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/81196761011.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/vozuvurupim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/jeopardy_game_maker.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/79573526270.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/97629220152.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/78457807821.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/94843506505.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/jepiwavoludosositujopulol.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/sogimazikak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/87930273274.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/munixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/52477930789.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/93957289886.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/41832885151.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8152/files/84568618069.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_off00006419.bin
3e1d2dcb2f216f3386514451395b5b4a0f564be8d467bb276664254d6e4dd98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 5012 bytes
font_01_sfnt_off00007539.bin
b67162fd7685c8e43f070bf9d15c44a9646cc6bfd7522eeac5493a426bfa6ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 9396 bytes

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