Malicious PDF — malware analysis report

Static analysis result for SHA-256 b856212a6de1a770…

MALICIOUS

PDF

46.3 KB Created: 2020-08-30 07:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d308accaca2f8216cec1f9e4c8912e9 SHA-1: 32544fa5ba449072b1ec7a97fd6ede417745c3d9 SHA-256: b856212a6de1a77008a44e10ecc5766de72ac843d80ee063ebdf24de075fb6c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a mass external link farm, with many links pointing to benign Shopify domains but one critical link to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking on malicious links. The ML classifier strongly supports the malicious verdict.

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=lowes+moving+coupon+post+office
    • https://static.usrfiles.com/ugd/9ff9b8_5d030ee7439f4eaf9f0fd96b928227ed.pdf
    • https://static.usrfiles.com/ugd/9c43ec_e5c9c8264e874ead9bc36f9dc99017d8.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_7de93e72d77e4085abfa84975422f29f.pdf
    • https://static.usrfiles.com/ugd/b8c837_679b4b7a431147a9a48470619d191e10.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/24485910102.pdf
    • https://cdn.shopify.com/s/files/1/0441/2620/8152/files/soxokobubeviloridoxav.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6110/files/26302756247.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/zavul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/saxon_math_intermediate_4_solutions_manual.pdf
    • https://static.usrfiles.com/ugd/3e87bf_3f19151eed2d4b0f93fb5cda2030f549.pdf
    • https://static.usrfiles.com/ugd/b8c837_16a197206b3d42e798e881b61fe74dd9.pdf
    • https://static.usrfiles.com/ugd/a86d68_7a78cf0cf57d4fb787a4ec8765508564.pdf
    • https://static.usrfiles.com/ugd/bd5c68_6c97a823f1074111bb4148ead45360fc.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/botepepirofofujojimaxov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/82223332940.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3215/files/22930160060.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/energizer_aa_battery_data_sheet.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_off00007229.bin
6eace89802fd5949bffd94b10eda4d1a14ca8a87e29bf7b8dd9424419fa443bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7229 5092 bytes
font_01_sfnt_off0000839b.bin
dc0f38f4adb8386051b1023f1010a8a07f6a5f402b9db4899b046de9e852db48
pdf-font-stream PDF embedded font (sfnt) at offset 0x839B 12608 bytes