Malicious PDF — malware analysis report

Static analysis result for SHA-256 7546966af5ef26c9…

MALICIOUS

PDF

35.7 KB Created: 2020-08-13 22:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e45979f5dc1b47b9ab321be69edfecf6 SHA-1: affb9c243ad5c150ba7f7958380d37f4ee692146 SHA-256: 7546966af5ef26c95fffb1f547dd6196edbbbffa31b5e13fe1e533aee166d4ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=blank+africa+map+pdf'. It also exhibits characteristics of a PDF link farm, containing numerous external links, many of which point to Shopify-hosted PDFs. The ML classifier strongly flagged this sample as malicious. The primary attack pattern involves luring users to a malicious site via a deceptive link.

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=blank+africa+map+pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://files.melissaaliss.com/uploads/1/3/0/7/130775633/8622638.pdf
    • http://files.alexjtunney.com/uploads/1/3/1/4/131437246/jafudazepif_taterodupu_dumigefob_nejabamubipes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/dodewidimiwexizikime.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/74198240619.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/88149667017.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6135/files/microsoft_project_portable.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/jaditunaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/bojokupekidosavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/anatomy_and_physiology_coloring_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/89558479165.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/popibamotupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/21770312771.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/55443603508.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0266/files/92808908453.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/29314654976.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/barriers_to_critical_and_creative_thinking.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_off00004cb7.bin
a778571b75727f4de67e3c2f8ca596244e602ae26d80b08566a7a5563bd2efc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB7 5236 bytes
font_01_sfnt_off00005e68.bin
7861e0cdf571f2deca383a8843c1eb7d4a908f7a7eace377958a83303ab4d839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 10480 bytes

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