Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f18ad3bd35f6c2…

MALICIOUS

PDF

43.8 KB Created: 2020-08-01 02:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15bb3b1bec08648a944dc6166c9a144 SHA-1: 4ab58f6eaadf92127892771f8eeeb1b00a20f33c SHA-256: 89f18ad3bd35f6c29024211fc008ddf37c468383d89abc809491b108de5c00a3
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 indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=microsoft+print+to+pdf+paper+size`. It also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=microsoft+print+to+pdf+paper+size
    • http://files.sincerelyyyourss.net/uploads/1/3/1/0/131070911/boziposuwiwekejene.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.goldcoastmodelrailwayclub.com/uploads/1/3/0/7/130775515/2605247.pdf
    • http://files.weightknowmore.com/uploads/1/3/0/7/130775201/falujolasu.pdf
    • http://files.andreacelestina.com/uploads/1/3/2/6/132681295/5ee594d.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/wafesat.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/bajovizibujadaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/xadabodewevotep.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/54019707708.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/notosejemiroketawoxekariv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7471/files/gupupoligamakiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/daduvigafobiduwix.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/lolulezosoxafob.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/2275517112.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/duwuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/1922947734.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/fixorabunoziraxazuriz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3190/files/muxagawovinufotu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c0.bin
f3a57d42be5a8128bf55e031c811c539607effaf84cf09c3a87e8feab98bd95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 4960 bytes
font_01_sfnt_off000072ab.bin
069fd02c6ef21377e14f6b8231dda7509db4c8196f445cbf17ea3dd66e79468d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AB 9800 bytes
font_02_sfnt_off00009427.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 4324 bytes

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