Malicious PDF — malware analysis report

Static analysis result for SHA-256 535826c5cafe96f9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-08 16:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a115008b22dc14f99d04fa3090581c8 SHA-1: 4bd9fefc7c72702443dc4c2c57eac7b60c2eddb8 SHA-256: 535826c5cafe96f9dd3da74f92c47b4303b8e5e526a4b64144069a31ca3095c6
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary attack vector. The document body and embedded links suggest a lure for a 'PDF to Word converter' to trick users into clicking the malicious URL. The numerous embedded links, many pointing to Shopify domains, are likely part of a link farm to improve search engine ranking for the malicious lure.

Heuristics 3

  • 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.
  • 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/pify?keyword=pdf+to+word+nitro+converter+free+download
    • http://files.elkriverlutheran.org/uploads/1/3/2/6/132681769/kogaku.pdf
    • http://files.dileoenglish11h.com/uploads/1/3/1/4/131483281/1173183.pdf
    • http://poxine.mylakehillsreserve.com/uploads/1/3/2/3/132302780/4725142.pdf
    • http://sufokiv.andrealimauro.com/uploads/1/3/0/8/130814921/welasujatufetujij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/apple_quicktime_trailers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/6309473215.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/fevedavulaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/pokemon_type_effectiveness_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/zuxedojopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/scarab_of_protection_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0431/3917/0466/files/8351376485.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/loreneso.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/tazafuporijebuvulojogi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/que_es_contexto_social.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/stardew_valley_quality_crops_bundle.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c4.bin
25092aa28597564d76507de9e55bfa1a3da26837edd7ab45dded607f549068df
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 4780 bytes
font_01_sfnt_off00007619.bin
0e8ff9796857921887f311ee0cf775cb9d67cbc0d65428c63bce9d97945f364a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 9860 bytes
font_02_sfnt_off000097c1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C1 4324 bytes