Malicious PDF — malware analysis report

Static analysis result for SHA-256 328a637f5353b163…

MALICIOUS

PDF

44.1 KB Created: 2020-09-01 12:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b90ced9d03767c3d7a30284a5641133 SHA-1: 51d8dd82753ebf8448f4112e2c2d03584777ef5d SHA-256: 328a637f5353b16312db226d55745c651c66bd35ddfd2f070cbf4ca1c4bc2611
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=abdiel+capital+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are benign but serve to obscure the malicious one. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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=abdiel+capital+pdf
    • https://cdn.shopify.com/s/files/1/0444/6614/3399/files/how_to_become_a_transformational_leader.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/archeage_unchained_lvl_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/anemia_hemolitik_autoimun_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/viremowapipaxunemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/agenesia_renal_y_malformacion_uterina.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/algebra_1_glencoe_mcgraw_hill_teacher_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/agile_project_management_training.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/foworo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/poteta.pdf
    • https://cdn.shopify.com/s/files/1/0462/6805/5714/files/3705715486.pdf
    • https://static.usrfiles.com/ugd/3649d2_7fe29ffa61ad4b69bb68a30488262064.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb8056e2478d4a9590e3d1a63ee3de1e.pdf
    • https://static.usrfiles.com/ugd/10b11f_6688515fa01542d6b4bc07775fd4802e.pdf
    • https://static.usrfiles.com/ugd/ab0441_521b23114fb546ab9f07d8ea407b8503.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e3700100bf8468690f178499c8e90fc.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/
    • https://cdn.shopify.com/s/files/1/043

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d2b.bin
8efba08fb2911046e48106d119f3dea7136b882228f28048d5f9c0b270525850
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 5004 bytes
font_01_sfnt_off00007e44.bin
380b19c8bd1e73e044b4c656b3574aa94f2bd413bc323cdf1b6a84cc292c4152
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E44 10852 bytes