Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce27a8f6bcfc4573…

MALICIOUS

PDF

90.6 KB Created: 2020-08-09 03:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21ce048bcc0de60f777989d0568f4d6 SHA-1: 9fab0efe01722eb1d6f013463b1509d8f9db9ca3 SHA-256: ce27a8f6bcfc45736d7dbbc6d21b578ac10d1c2b2bdec01bd62edff2c156ea04
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=historical+fiction+definition+pdf'. This URL is likely used to redirect users to malicious content. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=historical+fiction+definition+pdf
    • http://files.rubysresidences.com/uploads/1/3/0/8/130874394/toloxi-piruv.pdf
    • http://files.feelingsfitness.com/uploads/1/3/1/0/131070920/rugapefiribo.pdf
    • http://files.mrsboecking.com/uploads/1/3/1/8/131871648/79192.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/73137308457.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/zedalemubenume.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/67809424779.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/38593527285.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/pdf_to_word_converter_app_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/accounting_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/7831/2355/files/73708310429.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/planck_s_law_of_blackbody_radiation.pdf
    • https://cdn.shopify.com/s/files/1/0433/7002/1014/files/63399708847.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6160/files/bacteria_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/rajojokixugebibaligafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/jomapepajisitiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/3666466588.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_off0001282a.bin
cc9f1a2501885a613bc2de4f54fad7bf9cce21a7717ed320650bf5f7476045d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 5112 bytes
font_01_sfnt_off0001399b.bin
c88ed826d9c12ed63c2342e9f8a45e3deb35f2054fe27e322ead4e2dc1719da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 10272 bytes

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