Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b7bfe020c25be5…

MALICIOUS

PDF

47.1 KB Created: 2020-08-28 08:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c827053d1a27d38b0ac947139acb9f16 SHA-1: c3e221ddfde72083027cefa5bec1475178c409c7 SHA-256: c3b7bfe020c25be524129b8f9060b598412d3118909665d71afc7ae2a5cbb64e
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting it is the primary lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=problemas+transistores+resueltos
    • http://files.everettqualitylandscaping.com/uploads/1/3/0/9/130969659/6686444.pdf
    • http://files.sfboys1915gallipoli.info/uploads/1/3/0/8/130813546/824052.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/composite_numbers_have_answer_com.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/31944218920.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/majesty_2_maps.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/48265845039.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/10005801744.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3047/files/52656245466.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/vimabinotekigipasati.pdf
    • https://cdn.shopify.com/s/files/1/0465/7912/2343/files/20360231312.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/fallout_4_manufacturing_extended.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/samurai_x_reflection_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/difference_between_ip_camera_and_analog_camera.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/asian_games_2020_medal_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/79740523705.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007644.bin
3d93ff235be32250a42a824ca588a3b111b036f454f7df869a730b6527cb0828
pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 4972 bytes
font_01_sfnt_off0000870c.bin
1535a71a79c3f03f66ffded3728a04ef9b9da1b96e493fddb1bbf8c3823dfba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 11964 bytes