Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6776f7d9609cd0…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 405c9deed0e91f58088ec929443eaa69 SHA-1: 0bc315f7412776c0ec070c4f6f16d98b3ba6d9cf SHA-256: 0d6776f7d9609cd073eb7aeb15dda6ed4511315b8c472ef855ea878f5e4878b5
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though partially garbled, includes text related to PDF manipulation and references a URL that leads to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the heuristic firings suggest a phishing or redirection attempt.

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/wb?keyword=separate%20pdf%20to%20individual%20pages
    • http://najagogaj.eateverythinggood.com/uploads/1/3/1/3/131384201/fubowifi.pdf
    • http://files.mstreacyloves2travel.com/uploads/1/3/1/4/131438142/limegege.pdf
    • http://files.clarevet.com/uploads/1/3/0/7/130738814/6baf8b64a8319.pdf
    • http://pijip.howardhackneyimages.com/uploads/1/3/0/8/130813372/gafidesopolevovidixa.pdf
    • http://funapaken.mylifeinwyoming.com/uploads/1/3/1/6/131607600/vowebujadefuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/kavaramuwukurumedofup.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/2823125474.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/periodic_table_of_elements_list_with_atomic_mass.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/0997/4169/files/github_windows_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/how_to_rearrange_pages_in_adobe_pro.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/janufixitugojojagerupegov.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/afro_asian_literature_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/69289332066.pdf
    • https://cdn.shopify.com/s/files/1/0434/9663/6580/files/ak_47_movie_songs_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/food_quality_assurance.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005866.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5866 6744 bytes
font_01_sfnt_off0000694d.bin
c7d3e9ae8ca76001569054ac547dfeeb4deb3f927887e6530e7bc8cab5094ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694D 5372 bytes
font_02_sfnt_off00007ba3.bin
dd11340c17ec83ea302b81d9abc651f1db59b2c15f7624e7f11ad4c76175827a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 9980 bytes

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