Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d90cbf01568886…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 23:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab9946571e0869642e9464b7ce2099d SHA-1: 51c363d06635f5ecf8bc519d1cd3ce0491a3e079 SHA-256: f0d90cbf015688868bc54237275376b1391ee7a8ec3b05fa21ffa04ac1772ecb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL designed to impersonate a legitimate download. The document body and numerous embedded URLs, including one identified as a malicious redirector, support the conclusion that this PDF is a lure. The ML classifier also strongly indicated maliciousness.

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=adobe+reader+original+version+free
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.nachomamanc.com/uploads/1/3/1/8/131871744/zexasavom-kujudum.pdf
    • http://files.scarboroughanimalhospital.com/uploads/1/3/1/0/131070493/3665045.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/jefol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/retusuden.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/calendar_october_2019_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0452/8803/0370/files/pejetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/difference_between_phoneme_and_allophone.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/lijubanulexad.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/koxipugotigolugax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/zonalokubepabujevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/eu4_world_conquest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/metaphysical_bible_dictionary_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/20946216643.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_off00005e02.bin
829b052c36c7dcf8cc25ba9b826dbe7571deabb2e7f9c4f51aa91464878d67b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 5264 bytes
font_01_sfnt_off00006ff7.bin
bfe8f1730b2e5d3b5c4363d8833c578b62b5aade215f1d099ce96f2da8ee7934
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF7 9980 bytes