Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6283b3b83dacda…

MALICIOUS

PDF

72.9 KB Created: 2020-07-10 21:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb98b33633891426cdd5e0d2fd6d6a09 SHA-1: 3af52e596cc61ae8c1d34a519bdefb03cfa87bfa SHA-256: 8c6283b3b83dacdaa8ab23fd8759ceac7317123b38d5987d9f1f68a04e66f274
154 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, directing users to 'https://ttraff.com/wb?keyword=libro%20ortografia%20rae%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various external PDF files. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful content through deceptive links.

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.com/wb?keyword=libro%20ortografia%20rae%20pdf
    • http://files.insightsandilluminations.com/uploads/1/3/1/4/131453045/485ba9ebd953.pdf
    • http://files.bondentertainmentservices.com/uploads/1/3/2/6/132696280/ritilok_farerazexa.pdf
    • http://files.sineadwhite.com/uploads/1/3/1/4/131438231/dapajarakopasegur.pdf
    • http://files.firsteatright.org/uploads/1/3/1/4/131438073/6159626.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdf
    • http://files.tipsyfoods.com/uploads/1/3/0/9/130969089/mogom_tokatig_tevinewifewe_xirati.pdf
    • https://sazugakefibu.files.wordpress.com/2020/07/xumusakuzukuwum.pdf
    • https://remukoviwa.files.wordpress.com/2020/07/warevagebagobikege.pdf
    • https://buzereso.files.wordpress.com/2020/07/93985214669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53978683100.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/54789179951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/tudunon.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/soluxazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.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_off0000e15c.bin
4468d5708c476b9de14c65d63eedb4238b628587f7569a3410fe8aa588b3f1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 4764 bytes
font_01_sfnt_off0000f198.bin
a198d3a2f61841d6bdd9bb7382b93fffb3529338fb996f8faec6fb06d98144fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 11160 bytes

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