Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf800d6a3337ced0…

MALICIOUS

PDF

57.0 KB Created: 2020-08-10 03:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d578ab7905ea882cf9b48ed99126b036 SHA-1: 39e91e3612aea86a0fb704e74e177e0dfd633d2b SHA-256: bf800d6a3337ced03dd392c8ca3ea503e76dffc950aca90ad093ff01ba906afd
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=aerobic+sludge+digestion+process+pdf, which is likely intended to redirect the user to a malicious site. The presence of a large number of external PDF links also suggests a link farm or redirection tactic.

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/pify?keyword=aerobic+sludge+digestion+process+pdf
    • http://files.liverpooliti.com/uploads/1/3/1/3/131398473/68b1cdb7fe5c.pdf
    • http://files.majestichouseofprayer.org/uploads/1/3/1/3/131380029/rupakopezosoti.pdf
    • http://files.sola-boutique.com/uploads/1/3/0/9/130969728/xefafesisago.pdf
    • https://cdn.shopify.com/s/files/1/0434/2605/4306/files/kujawekupewejukilibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4143/9400/files/32460374751.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/30992081856.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/9718135965.pdf
    • https://cdn.shopify.com/s/files/1/0434/4083/2678/files/55927263344.pdf
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/boluxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/poputinexogezij.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/atlas_anatomy_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/kitab_bajuri_jilid_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7383/files/pasonaveremuved.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/minecraft_pumpkin_pie.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/81011393354.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/91388544536.pdf
    • https://cdn.shopify.com/s/files/1/0453/9475/5752/files/actual_vapour_compression_refrigeration_cycle.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_off0000a03a.bin
54d18a7d02dc610ed4f76d3c74b3fe1afe9fabf968734c4f2f6533f3e10bd7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03A 5240 bytes
font_01_sfnt_off0000b21e.bin
8d8cd5c66f87a08b51589119f125b2a0e8ca4f916e3f7cf7f9f7dbfd1414ba05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 10728 bytes

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