Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f59ac4503fe7ec…

MALICIOUS

PDF

34.3 KB Created: 2020-08-29 08:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c03609fe10c2886a6db06402586f9ec SHA-1: 0f800353e6846f2d760836a4f6e4ef66c785521e SHA-256: 08f59ac4503fe7eca012f04f08f8f4aaee8aed456f2229b925609b58c2acfdc7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firings indicate an attempt to redirect the user to malicious infrastructure, likely as part of a phishing or scam campaign.

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/wix?keyword=c3+corvette+parking+brake
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a4d71394db514285b0e877aaeb746780.pdf
    • https://static.usrfiles.com/ugd/b8c837_a927fb0957c1426aac563ceaf608d715.pdf
    • https://static.usrfiles.com/ugd/b8c837_24e161106c194280bc354221f0f6fc7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a7332620b51444ea99b42c5d45787b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd8830d35ba4391b53be5fa57fbe761.pdf
    • https://cdn.shopify.com/s/files/1/0444/4497/5271/files/blank_map_of_central_america.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/birth_by_sleep_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/worksheets_possessive_pronouns_esl.pdf
    • https://cdn.shopify.com/s/files/1/0437/5353/7685/files/cch_tch_trang_online.pdf
    • https://static.usrfiles.com/ugd/b8c837_a855fcab3217404f9446bcf89fbb67c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b832b9a38e744de4ad2ae6d6bb618ed0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e26aba2fe3248e48108a57d43fa3a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e91711ccfa54e94b17555a97fe530a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6250a253c848d9bf17ad1eedaefbd7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048f9.bin
91b2f73648084e1b2b1648908b76b798db492b449ca45e638b403893b1188293
pdf-font-stream PDF embedded font (sfnt) at offset 0x48F9 5224 bytes
font_01_sfnt_off00005ad2.bin
28f68518fd020993cd3e6ebe47ff5e0a71b6f8e09cbddd96fa266c51a3409bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD2 10056 bytes