Malicious PDF — malware analysis report

Static analysis result for SHA-256 defd3605db4f1f98…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 00:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74167fb0f04736c24dfbcb6b96bd445 SHA-1: f72785b546977a6ffc4ad9e2b6d5e8ab28930298 SHA-256: defd3605db4f1f98efd2229988a3380217f4625e02c86463bb46b3a5b8bc35ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF file contains a large number of embedded URLs, including a critical finding of a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains non-readable characters, but the presence of the malicious redirector URL and the link farm suggests a phishing or redirection attack. No scripts were extracted from this sample.

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.ru/wix?keyword=2005+buick+terraza
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/gw2_necromancer_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/passive_voice_present_past_future_simple_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0438/9801/1816/files/80470342630.pdf
    • https://cdn.shopify.com/s/files/1/0454/0868/2152/files/bunco_score_sheets_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_9015b1e3454d4fabb526a9633a00aa3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e849912209f04ee8b3916722d17836b9.pdf
    • https://static.usrfiles.com/ugd/ca32a8_2be8ae65d8db46eba88d8cb236e34196.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0812bb7e82e41c58e9700235dc98bac.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0dfbb803454a58ae86d92512682165.pdf
    • https://static.usrfiles.com/ugd/cc14e4_389636d756db419f81050f4009d1ffab.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b62fde182245a490cdfdb8545c9830.pdf
    • https://static.usrfiles.com/ugd/e4a001_cd444872fd6d46d8ae9e18f448a346bc.pdf
    • https://static.usrfiles.com/ugd/a4e402_8fb039fe04644f4983a91d73bcd981e1.pdf
    • https://cdn.shopify.com/s/files/1/0454/8834/1142/files/algebra_2_and_trigonometry_textbook_prentice_hall.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/tafupapovepulub.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_off00006611.bin
bd3fe4c2e6eee78e9090799eb6001f9aa9886f40306c142dede9c1e05cdde0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 5140 bytes
font_01_sfnt_off0000779f.bin
029c0cf9b0470c0a7f5a23f746f6f8fec988d5befdfc6c76d7012089fe4ec277
pdf-font-stream PDF embedded font (sfnt) at offset 0x779F 15448 bytes