Malicious PDF — malware analysis report

Static analysis result for SHA-256 497e5f0c0e7a8af5…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 04:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1868a2a2f71251eab5a5fea62bf53c SHA-1: f6f947a3d546eee2550a3dacc08a66ab430eeed3 SHA-256: 497e5f0c0e7a8af5dd44858e1345297048e7e48edfb2d7fb6532e5ac0137585b
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL and a keyword suggesting a search lure. The presence of numerous benign Shopify links suggests a link farm used for SEO poisoning to attract victims. The ML classifier strongly indicates malicious intent.

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=paint+net+remove+background
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/3d_shapes_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/senuxejiweravivipasepab.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/water_prevention_and_control_of_pollution_act_1974.pdf
    • https://cdn.shopify.com/s/files/1/0437/5940/3157/files/microsoft_device_association_root_enumerator_sekiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/buveraresobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/97572115142.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7644/files/beleg.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/20486663306.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/gemoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1226/7937/files/bereka.pdf
    • https://cdn.shopify.com/s/files/1/0429/2696/4903/files/25197052101.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9222/files/1390249584.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/podofofexub.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_off00006ed7.bin
a5d4ed8a6c95d11bb3e42bb92a6c1578627008c79d21839436723e036073a016
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 5312 bytes
font_01_sfnt_off000080d2.bin
697f513b7bd96f2ec51cee8984af66b52c11afe467758bb0e2400b255a81cd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D2 10372 bytes