Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fedf670420c959…

MALICIOUS

PDF

53.5 KB Created: 2020-08-21 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1085283325042d0e7c1be0959c17494 SHA-1: b0e41af386b8fb2454c08ee0049c7bb628eae5ff SHA-256: 09fedf670420c9598bdca18fe82f51bc507a719d2fb3f110e9553aadade30feb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a download for 'Ansys workbench 17.0'. It also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning attempt to attract victims. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=ansys+workbench+17.+0
    • http://wusexok.durantroadpetresort.com/uploads/1/3/2/6/132681231/2058883.pdf
    • http://files.wildlilacdesigns.shop/uploads/1/3/2/6/132681501/3960846.pdf
    • http://files.survivorsofstrokeniagara.com/uploads/1/3/1/4/131438056/0534d.pdf
    • http://negirixad.cencalproperty.com/uploads/1/3/1/3/131382274/sipanesifonimo_xutojet.pdf
    • http://tegopem.grangerlandrfd.com/uploads/1/3/2/7/132741100/43a2b5bff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4388/9057/files/pepevimazejaxoguf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/mokotokamesasolo.pdf
    • https://cdn.shopify.com/s/files/1/0447/3182/6325/files/gothic_calligraphy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/introduction_to_statistical_learning_github.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/bawoforeganenow.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/agenda_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/jozotiwotirukoraru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/bojangles_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/semolusumawugadoboni.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072cd.bin
1e6ca63978bb9fb4e928f1c82af36d1d4519db9bf635f00f4751bcbad0c0cb9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 10160 bytes
font_01_sfnt_off0000941a.bin
93abdf40fa4140fafe3a6615c47c38179229b3fca3978e67de7c9edab70ddca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 5340 bytes
font_02_sfnt_off0000a66c.bin
62528785c55c34f9ec0e0681075c2e557db4ce5119fe89a1421a9ffb836f9636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA66C 10192 bytes

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