Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6cbaf239b0b705…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 13:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c9eb54348a0ba882d9d589291e8592 SHA-1: babf8e6fe2dd173b97a9ad8c186fe83c7851f4b6 SHA-256: 9a6cbaf239b0b705e89d1d76d1da0ecd5a25c5433178d82db5d58787e1110e72
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Iso 2859 latest version' and a URL that aligns with the malicious redirector finding. The presence of numerous links, many pointing to static.usrfiles.com, suggests a coordinated effort to distribute malicious content. 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=iso+2859+latest+version
    • https://static.usrfiles.com/ugd/b8c837_daf473557cde4217b9b9c2eee6f07215.pdf
    • https://static.usrfiles.com/ugd/f14cf6_4a38d5eea1cc48b594376a9163c21658.pdf
    • https://static.usrfiles.com/ugd/07625c_94e3890784034e42a47236efbd65e51e.pdf
    • https://static.usrfiles.com/ugd/45e30f_8c36d5ecbe9d4ff9a8faa9d3ca7bfc64.pdf
    • https://static.usrfiles.com/ugd/8d57bd_fc8c1e21b97c41ee878c381a5e5629d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f3e1cbf8447b7ab0616285f8b1dff.pdf
    • https://static.usrfiles.com/ugd/01e791_b6f66ff7e207471b91d1be75514309c2.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c96047ab62954fc9a54c9115c8cb5ef6.pdf
    • https://static.usrfiles.com/ugd/cd79e3_1faa28042a2f46c89d40092e99ed4a8b.pdf
    • https://static.usrfiles.com/ugd/64d889_1b2a523031564841ae4d3c77a68498bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.pdf
    • https://static.usrfiles.com/ugd/de3d83_e2577106dbad4318abb0499522fd3781.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/aoe_ii_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/1342764196.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/dipifitojusupege.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f44.bin
e10a05c91907d3cac4ed129cece9c59ae6a483e2a34289e49fb250a9da97624c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F44 5280 bytes
font_01_sfnt_off00007111.bin
be917c0db7373273820b965e09a90eb2fe17fe2eb699b6f9fe1ec8b3b19cfce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7111 6168 bytes
font_02_sfnt_off00007ffe.bin
513af632110ff89a81d7fee81f85e8467787e220b41d2bf29ac5d7233b539a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 10240 bytes

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