Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f86ac8cc93048…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 17:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65a52d49ac11f927ffdb9a1dbc2a7dad SHA-1: e6b182bb1c35d770843049d7e656466392c296e0 SHA-256: 5a3f86ac8cc93048272e27385c5ddaa18a681279129c92c2149ec6c9bb74fca7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'Pokemon games 2019 android' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to host 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.ru/wix?keyword=pokemon+games+2019+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ad3664f75d21438c9aca8596a88ec93b.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_7e15fb6fece5427ea267d233d70d6ddc.pdf
    • https://static.usrfiles.com/ugd/b7082a_9528769348c841a494c3615b7de476be.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/anthropology_ugc_net_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/bolaw.pdf
    • https://cdn.shopify.com/s/files/1/0447/9749/3405/files/funny_jokes_in_nepali.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/55668036611.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/38319108106.pdf
    • https://cdn.shopify.com/s/files/1/0457/7165/3276/files/vomosupuvoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/lower_back_pain_physio_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/98180604969.pdf
    • https://cdn.shopify.com/s/files/1/0433/7323/2291/files/10696434429.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/guided_tours_rome_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/platform_heels_sandals_rhinestone.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063cd.bin
fd95332f5e0c19122dccbd8a049babb769f4b46590b848f66ffc58f7327cfea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 5660 bytes
font_01_sfnt_off000076f6.bin
5076572640c961f6478c26a4a405d882202c26c29924fb1a8a97dfc5f308ea73
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F6 10248 bytes