Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd43121825971673…

MALICIOUS

PDF

50.7 KB Created: 2020-09-05 03:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3647347c9e0ea5433ccf6ab2be447b14 SHA-1: 3c16f93965b4193d148656d9ef8d3e4b36daea0c SHA-256: bd4312182597167368e77fe7e8c66f8c61dc24e81010578762abbe4eb8dec497
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. The document body, though heavily obfuscated, includes text related to 'Oracle database developer interview questions and answers' and the malicious URL, suggesting a lure to entice users to click the link. The presence of numerous embedded URLs, many hosted on Shopify, further supports the SEO-based link farm heuristic, indicating an attempt to distribute malicious content through seemingly legitimate platforms.

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.me/wix?keyword=oracle+database+developer+interview+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/32790782706.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/simple_present_tense_exercises_advanced_level.pdf
    • https://cdn.shopify.com/s/files/1/0436/9360/5014/files/autocad_3d_max_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/konefeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/effects_of_water_pollution_on_environment.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/characteristics_of_situational_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fanujaxolefemonepagipomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/fawopovobujokorureloxamid.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/game_bully_lite_apk_data_200mb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/vapenaxawijatiduneliwije.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/zelirudinapofewezodap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6314/files/adobe_acrobat_pro_download_free_tria.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/affichage_obligatoire_interdiction_de_vapoter.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/22616689242.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/1/0434/1645/3272/files/22616689242

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f0.bin
c7fd2077507da7e33dcf4a69234166d0958f3b040b3790af83e0a700a630f19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 5512 bytes
font_01_sfnt_off00007cbe.bin
a83367cc65dcc70ae7e9a4861f19f1c0de907ffc8c67c3007c93d6c994b3d7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBE 13336 bytes
font_02_sfnt_off0000a76b.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA76B 16204 bytes

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