Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ef4874ff61c2d…

MALICIOUS

PDF

58.0 KB Created: 2020-08-31 13:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dbae1334981c892d7338f070699dda4 SHA-1: ef4f8a1ca9e2c76ea0c6230bc0220c34fd839df0 SHA-256: 136ef4874ff61c2d73e975e44472c2c2a105d6e853cdd201f7ec203a019c82f3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=biodata+for+marriage+pdf+file', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking it. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a potential link farm strategy. The ML classifier strongly indicates 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.cc/wix?keyword=biodata+for+marriage+pdf+file
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/0b46e6_2cc1193a33b145fda7dfd8622ce81123.pdf
    • https://static.usrfiles.com/ugd/d1c05f_40f87b117240407082f75d26cd007fd7.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_ee069e6cde7c44228034632a8128db6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6a7acd930df4189b0463412e8d27f4b.pdf
    • https://static.usrfiles.com/ugd/52b593_d603c14aa7be49ab888976c40f3550f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_24c4568d38144288a23f171b05086522.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dfd60b35f3e44b8b92fc60f917c2efa.pdf
    • https://static.usrfiles.com/ugd/b8c837_a00b39fa349240669eb7eb1927b1ac20.pdf
    • https://static.usrfiles.com/ugd/078c79_01be5c5ff91f475c9769e90dbf5bfd71.pdf
    • https://static.usrfiles.com/ugd/a107db_5646cb15a25541c38c29561f0620b9b9.pdf
    • https://static.usrfiles.com/ugd/21e6f2_3201e0f43bb94c84bc118da6f011753e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcd8973795be41eb839cd04e31656ea2.pdf
    • https://static.usrfiles.com/ugd/930050_46b718b084514bcebc6bf6424d9166c5.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091c3.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C3 2828 bytes
font_01_sfnt_off00009bbd.bin
ccede854ddea5fca6104930789412be1200b35379f3446e43dfda9ca27efdb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBD 5232 bytes
font_02_sfnt_off0000ad79.bin
aeec5a3d07716bce6ddb08163af06c60560312185efe9a5c7643180ab9f55b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD79 9964 bytes
font_03_sfnt_off0000cfc3.bin
fa10742c3ceeca03b1674e2544f83133ec31cd73131532c82f628c807ed321b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 2628 bytes

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