Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce407e7b4b6d81…

MALICIOUS

PDF

103.2 KB Created: 2020-07-30 15:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 607e68467c1cd355ea7c9584b7852a94 SHA-1: ec9a2c58c1603fc0776eb435fb2a56fa6c3919b2 SHA-256: 66ce407e7b4b6d81d37e9e6174127a68267a27d5799bcc668c89cc5dd2786f35
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL pointing to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, but the presence of a URL related to 'biological wastewater treatment process design calculations pdf' suggests a lure for users searching for technical documents.

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=biological+wastewater+treatment+process+design+calculations+pdf
    • http://files.dermasheer.com/uploads/1/3/1/6/131637254/mokabonafoz.pdf
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdf
    • http://files.humankindjournal.org/uploads/1/3/1/0/131070302/gixotil_zamovekeluwejaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/fezusijoropiwamelimo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/6920847556.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/67991586332.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/79116359636.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/vuwom.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/26126283510.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/64175868624.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/41117289801.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/22068755685.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/kavafapifirulid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/40915165954.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e75.bin
e7b71c1fb81b58fc560d90b1f16639725af23431e05f84c4654ca1215e954992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 5500 bytes
font_01_sfnt_off00015116.bin
4a7063b6c706334a3df81631bd7ee34c70bf42514755e13443e4a6b80780e0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 11432 bytes
font_02_sfnt_off0001781d.bin
96db492adf3d082e1438ff72bc17c6d4f724b67599921063c5928f6f308df987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1781D 16232 bytes

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