Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b3ca822d37272c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e3bcff257b828eed258fbe5560c9df SHA-1: 63a6db7533624040577d4f42de4d50d0f97a73cd SHA-256: 51b3ca822d37272cce91c6750ded94c0b7ffcb674125085fce495fa3e7967dbc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself, though heavily obfuscated, contains text suggesting it is a 'loan agreement form'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. The primary malicious URL is https://ttraff.cc/pify?keyword=loan+agreement+form+in+word+format, which likely leads to further malicious content.

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=loan+agreement+form+in+word+format
    • http://files.hookergospelofgrace.com/uploads/1/3/1/0/131070161/a7933b37e6686.pdf
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/maths_problem_solving_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/29297059501.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/hindu_beliefs_and_practices.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/94162208741.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/d_d_5e_guiding_bolt.pdf
    • https://cdn.shopify.com/s/files/1/0450/6664/9750/files/63031758988.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/grade_calculator_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/4590/2746/files/xoweradililuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/chhota_bheem_cartoon_games.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/modal_verbs_advanced_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/vebumalofuwetutunekuz.pdf
    • https://cdn.shopify.com/s/files/1/0444/5965/5335/files/penguin_books_logo.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_off0000656d.bin
156287698cb381cf69ed4b1de9b83da49162fe0ca22ac5f47154b3ee9112a23f
pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 5048 bytes
font_01_sfnt_off00007699.bin
0f1f169d709a22819a962ec12b091d2581102b1da5aea9c5a5e3ad7cea07d3ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 10700 bytes