Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c68ef6ee70cbf4…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 21:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d4088bdc711099ec809b05f14467f3 SHA-1: ab3ab14f44377dadc6a127f32c10bfc8a727eef9 SHA-256: 01c68ef6ee70cbf43e13ef929eb14cae454ac363407aed97d2a863834870c1dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a coordinated effort to direct users to potentially harmful content. The ML classifier also strongly indicated 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.ru/wix?keyword=world+book+encyclopedia+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/238140_3eff53022de84c68bc39ec6708440b0e.pdf
    • https://static.usrfiles.com/ugd/38bf1f_18b7483a23ce429288871bdbba432555.pdf
    • https://static.usrfiles.com/ugd/b8c837_b77d207c14c04e569c7a4c6da3a3e7e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_820a5227004c441c8dc8a2499c615489.pdf
    • https://static.usrfiles.com/ugd/516793_276362e712d44d1791b93287b86debfe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/ringtones_for_android_instrumental.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/free_certificate_border_templates_for_word.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/bhojpuri_song_dj_video.pdf
    • https://static.usrfiles.com/ugd/b8c837_9624d14830c74476a1917027b3de8b7f.pdf
    • https://static.usrfiles.com/ugd/1849a1_d13c9121fabf4b30a17cb41805485e6a.pdf
    • https://static.usrfiles.com/ugd/136d07_abbcc4af82004b9b9065e691ff742953.pdf
    • https://static.usrfiles.com/ugd/b8c837_15391b1509634ac7be1bed88aeae6e23.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/tavokotamam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/84614213199.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_off00005f71.bin
ab4e70ff8b545e5a187a5e982cae248965c6bf7997caf9963792917bb58bfee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F71 5728 bytes
font_01_sfnt_off0000731a.bin
b328281d5812d72138187e35196818cda0ff1fbf213bd11bf4d08ac3c80fc250
pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 10704 bytes