Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8fa3eeb8ffb2a8…

MALICIOUS

PDF

44.7 KB Created: 2020-07-28 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba7b5c4b850c9daf372f6a84cb91f8a SHA-1: 266fd6f402a9845bb303be76bd109b96141ff227 SHA-256: bb8fa3eeb8ffb2a8fcc3cc46a1e1b4d9f7fb8909d20ecf10594ddb6618392674
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=odia+song+video+dj++mp4'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0434/3716/2657/files/46501344685.pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its direct content, but the presence of malicious links is sufficient evidence of a malicious intent, likely phishing or malware delivery.

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=odia+song+video+dj++mp4
    • http://files.twolazylittledogs.com/uploads/1/3/1/3/131379443/2175952.pdf
    • http://files.nyssajowallace.com/uploads/1/3/2/6/132680808/ac38a20c0ee.pdf
    • http://files.rebeccabelldressage.com/uploads/1/3/1/4/131453432/8443137.pdf
    • http://files.rohrsacupuncture.com/uploads/1/3/1/4/131406604/fuviligawinu.pdf
    • http://files.greathorwoodhistory.org/uploads/1/3/2/6/132681728/2495463.pdf
    • http://files.nyssajowallace.com/uploads/1/3/2/6/132680808/
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/46501344685.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/betuxoponubunole.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/zivorovujolafegu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/jidatim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37604868145.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/35987741141.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/pipajimafewarotakaloga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7384/files/jibekasediruwojim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1436/files/sapiravitufel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/wavivopiloxesawaze.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4802/files/36024209332.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_off000062be.bin
10277db658447a3a83879ec9dc788c9a36285dda881a7b5e0c897e7a7621a2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 5112 bytes
font_01_sfnt_off0000741f.bin
00809815839b6d9fdf17daac5ff5f2edcb66974024a0cde31574643e9253a428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 15504 bytes

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