Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c2946cc5f32570…

MALICIOUS

PDF

41.3 KB Created: 2020-09-01 16:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f5ccc66ed8d8d80325fd0cc5d89d39 SHA-1: a332439aece570bdf3517ba926b972bb51b221be SHA-256: 90c2946cc5f32570abeada40116c2d67700b88ca03a5bd350ac3b1af4981ac4b
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.me). The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it is a link farm designed to redirect users. The document body, though heavily obfuscated, contains the same redirector URL and a keyword suggesting a lure.

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.me/wix?keyword=catholic+bible+daily+readings+free
    • https://static.usrfiles.com/ugd/1849a1_8dc78e7841624235b0134636fe0eb15f.pdf
    • https://static.usrfiles.com/ugd/fbccce_344eedbe95324a7ba6fb1af60baae13b.pdf
    • https://static.usrfiles.com/ugd/41f880_47db9de691d94bb488e4e8f4c4773d90.pdf
    • https://cdn.shopify.com/s/files/1/0438/4810/6134/files/78964743035.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/8259306001.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/bozopediseponeloxepel.pdf
    • https://cdn.shopify.com/s/files/1/0463/3785/1553/files/wigaxewumes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/5226400316.pdf
    • https://cdn.shopify.com/s/files/1/0436/8701/8649/files/32699246924.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/15097618875.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/53125499324.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_off0000626c.bin
34f5928131c74c8d56353ed8860983ea30eb1e4d63b053e85bfb2b2f4b4ad5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 5432 bytes
font_01_sfnt_off000074dc.bin
e6de72348e94b91780ba8c366299ea8a542f00eca31cb39edb0e17f8ca7cd620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DC 10548 bytes

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