Malicious PDF — malware analysis report

Static analysis result for SHA-256 9291b61bf5244f06…

MALICIOUS

PDF

54.7 KB Created: 2020-08-17 03:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd78aa0d96e86f015664936a33e8676e SHA-1: 087ef7635b7813bf80c3d954d66dd0e12ed61c6a SHA-256: 9291b61bf5244f062a58cfebb76f8b78d7924a6e06b30073fe2d223fd7c3c639
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=admob+native+ads+in+listview+android'. Another critical heuristic noted a large PDF link farm, with many links pointing to Shopify domains, likely used to obscure the true malicious destination. The document body contains garbled text but also includes the malicious URL, reinforcing the redirection attempt.

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.ru/pify?keyword=admob+native+ads+in+listview+android
    • http://mapupako.artfix.info/uploads/1/3/1/4/131407227/4223d8d221938ae.pdf
    • http://files.polarlondon.co.uk/uploads/1/3/2/7/132712209/5489222.pdf
    • http://files.helloworldwerehere.com/uploads/1/3/1/4/131438474/mejefapitu-ligizuw.pdf
    • http://files.mountainoven.com/uploads/1/3/1/3/131398419/mirevowatuwesunifit.pdf
    • http://files.richtechnologygroup.com/uploads/1/3/1/6/131606858/4178912.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/67878913172.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/82944584710.pdf
    • https://cdn.shopify.com/s/files/1/0435/8507/7405/files/molepemezukusos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/28720523351.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/zurebejubobog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/vedasosolotupowizokewir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/70586229992.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/garfield_kart_apk_hack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/nudikunurinik.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/49952716486.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/71323558429.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_off00008e21.bin
6de95a658315d8d9d077da490716bb7e25be35dbfb03959651b54aa0121e819b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E21 5252 bytes
font_01_sfnt_off00009ff4.bin
fd65b5f951fea9a8fb7e8c10f79c7ba8b2fa46eac08b79415d6178ec0cf1b01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF4 14400 bytes

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