Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a00cafc16ffc2a…

MALICIOUS

PDF

60.8 KB Created: 2020-08-11 00:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c611ef06ab62e5aa1eef9fa83a60a171 SHA-1: 696b69288c9f93da35de3ac9482021c3f5e1d782 SHA-256: a4a00cafc16ffc2a67447dca2d8792778a81d33244a21c62fe9500d893468699
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used to lure victims. It also contains a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The document body, though partially corrupted, contains text related to a 'Salesforce developer tutorial' and the malicious URL, suggesting a social engineering pretext. The ML classifier 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.com/pify?keyword=salesforce+developer+tutorial+for+beginners+pdf
    • http://files.drawlondon.co.uk/uploads/1/3/0/8/130814052/nanurewin.pdf
    • http://files.benkirkefamily.com/uploads/1/3/1/3/131398000/6b7fd19b7.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/1/6/131637919/vapurisadeneju_votatujitonufi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2581/files/rutasapubilibinawew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/54387246750.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/14238588865.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/super_smash_flash_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/kezizuberuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/49274038054.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/sadadomawopujavila.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/sevegaxesivev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/lugamowepuzadanetexos.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/26002551852.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/nefonumerosexosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/resofilomuxarerul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4446/9927/files/beguximoka.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_off0000adea.bin
49f609325f206be4b8922eb928b804ade1121b764193bb4699fbf7be5d2a11a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 5624 bytes
font_01_sfnt_off0000c113.bin
4920ee2cf2ffbe0214ac36fcbafefe3b4077b514acccf0326726e9c3a387d3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 10816 bytes

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