Malicious PDF — malware analysis report

Static analysis result for SHA-256 8395451ed802bb70…

MALICIOUS

PDF

48.0 KB Created: 2020-07-20 23:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50c7c42878e2ace87b99641e1477cee SHA-1: d954df402cab31677f9fa2764a89cb599cab6736 SHA-256: 8395451ed802bb705186454e519a2f4152d2bb375b1b0360a6ca5ef8b0063461
152 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 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to earning apps, suggesting a lure for phishing or scamming.

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/pify?keyword=best+earning+app+for+android+in+bangladesh
    • http://files.skybluecounseling.com/uploads/1/3/0/9/130969048/2439452.pdf
    • http://files.bythebible.org/uploads/1/3/0/8/130873781/fozimibigenu.pdf
    • http://files.julianoshea.com/uploads/1/3/1/4/131453807/jibumojexoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8981/files/45981161368.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/43922716377.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/77455695206.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/32875196937.pdf
    • https://netupobupu.files.wordpress.com/2020/07/78967565237.pdf
    • https://josejoxoboko.files.wordpress.com/2020/06/66126598822.pdf
    • https://gitelapil.files.wordpress.com/2020/06/dikoketadazudipun.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/vuvemedixulovijabofore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/togakajimed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/noduronasava.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/5990/files/44721179100.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/sinajametugiseto.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/julutason.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/73172841934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/17724791963.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/tobovejasige.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_off00007c61.bin
6f43b03f8834f1f1ceea22fdf8505b68dc05e439138da3cac4bc6471cff89f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 5280 bytes
font_01_sfnt_off00008e3c.bin
3d7eb54f0739257063795d50dc454cd58a7742a7352fa11097c28d4400bd5b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3C 10592 bytes

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