Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e32e1d3d642d41…

MALICIOUS

PDF

47.7 KB Created: 2020-08-09 18:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2270e2e5a5de3acaf229bf69b04946b0 SHA-1: 5efe22f4154d8ce5696ae5540f5d6ec8e4da7237 SHA-256: f1e32e1d3d642d417628e18d37f901f3721dfffdbe931854ab674516e9c4bc59
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=improve+analytical+skills+pdf'. This URL is presented within the document body, suggesting a social engineering lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results or distribute content, further supporting the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=improve+analytical+skills+pdf
    • http://files.glamourouskitty.com/uploads/1/3/1/3/131380420/vekul_vobitalepirom.pdf
    • http://files.polarcenter-bg.com/uploads/1/3/0/9/130970004/c40b681752.pdf
    • http://files.cyrenawellbeing.com/uploads/1/3/0/7/130776326/tirevize.pdf
    • http://files.clcem.net/uploads/1/3/1/8/131871658/resukenutuwimi_womekukamo_tukurinajuxemes.pdf
    • http://files.historiaflorals.com/uploads/1/3/1/4/131407148/jatipinasogetomikix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/ageless_body_timeless_mind_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/40499431378.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/52740670161.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/46562518900.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/varices_esofagicas_tratamiento_farmacologico.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/vubolipibisejawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/refimutumuzotuvubal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/tuzaveromabefo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/54762859382.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/goviviniwikoxonadoziwige.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/minediduzemawazuguleguliv.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_off00007a5f.bin
21aae0b963d819759069ea2ac2174097253bead49cf0f59dc395fbbee0536d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 5464 bytes
font_01_sfnt_off00008ceb.bin
315732c88f006d1fbba7ff085c9e88d11e0323e28ef942f6df48dc01d7572175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEB 10684 bytes

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