Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd2ccf02084bf62…

MALICIOUS

PDF

45.0 KB Created: 2020-08-27 17:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e23bb08a58f07713f39b373de5956e SHA-1: e402bec7f71e0291f78604dd468969dc415d416a SHA-256: cbd2ccf02084bf62ebfbb6bf3c500cddecf99973779a69d618cd821d0f52a8f5
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a free reading passage. The document also contains a large number of external links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier 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.cc/pify?keyword=free+timed+reading+passages+for+2nd+grade
    • http://xedupure.jsnobles.com/uploads/1/3/1/6/131606289/cbc6a3a5267.pdf
    • http://jibinape.vermilionnature.com/uploads/1/3/1/1/131164250/0bfccf.pdf
    • http://files.lissalubinskimd.com/uploads/1/3/1/6/131637649/decb6b2582cafe.pdf
    • http://files.supportlifepdhc.org/uploads/1/3/1/4/131437306/a4780910f34ea.pdf
    • http://wifugosir.rockymountainautoparts.com/uploads/1/3/1/1/131163635/vusivajefimo_bedazefizemut_pekuxenuwesebo_zadaduwidale.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/tafsiira_qur_aana_afaan_oromoo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/48735203949.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/jazukexuzupubiponuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/67193908948.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/43905956828.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/ashampoo_photo_commander_16_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/audiometria_tonal_liminar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2700/4577/files/apprendre__dessiner_avec_le_cerveau_droit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/bokixuzefaburalowab.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6849/files/65227669838.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/java_min_value.pdf
    • https://cdn.shopify.com/s/files/1/0461/4396/3299/files/18191433418.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/xobudeguwivamepanaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/south_african_national_lottery_funding_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4629/files/statistics_class_11.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_off00006c73.bin
251aad0ec22eda5de674d962c901b666263d0e2c8b90d6dd0f11650a475a2e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C73 5416 bytes
font_01_sfnt_off00007ec8.bin
39e99db9df35a2875871d5498825e1938b268c3dfe8c0921166f18ca15746be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 11296 bytes

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