Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ffb7931efad603…

MALICIOUS

PDF

58.5 KB Created: 2020-08-09 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be66871b89e1bed59f6e3a432272299f SHA-1: db83bc84a5bf4ab2e8238e6783ea845bcf16276a SHA-256: 76ffb7931efad603713aaa09a69f234de3303ca1d3bcf0d1710776266153ba3a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying it as a link farm pointing to a redirector. The primary malicious URL is https://ttraff.com/pify?keyword=positive+buck+boost+converter+pdf, which likely leads to a malicious payload or phishing page. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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=positive+buck+boost+converter+pdf
    • http://files.dogwalkingpals.com/uploads/1/3/1/6/131606719/75c31b.pdf
    • http://files.theriverrunsthroughus.uk/uploads/1/3/0/8/130814390/luxuzidubum.pdf
    • http://files.willdeandesigns.com/uploads/1/3/1/4/131437421/6096577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/70368815595.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/lagozubereler.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/1947_dodge_truck_parts.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8969/files/linear_and_nonlinear_functional_analysis_with_applications_ciarlet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/vodisiwekuvukuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/11329261463.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/30526571439.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/xesejotoxujumikusoxop.pdf
    • https://cdn.shopify.com/s/files/1/0433/9426/9333/files/39917317574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/89732718731.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/16643656702.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/zuwigadugegazalefuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c14.bin
61276b2de0339eca1c5933da15afb61f5262987f428b634af1176d1ef8a5ae39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C14 5056 bytes
font_01_sfnt_off00008d54.bin
61393b261f8adf7d641f8c2e5b837b787f7af4bca6b9b8bec6c0b958c379e673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D54 13764 bytes
font_02_sfnt_off0000b9ab.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 16036 bytes
font_03_sfnt_off0000ce15.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 4324 bytes

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