Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8ca7d968383fba…

MALICIOUS

PDF

39.9 KB Created: 2020-08-01 17:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a63db6764067224a9b515753aab2fc0 SHA-1: e9985ab5d8d51e46557f4ff56a5ed9be253a8ebe SHA-256: 4f8ca7d968383fba02c62cbee66e93d9a83031e41e217984ffa3c93b673f7ee4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=www+seriesflv+net' which is also present in the heuristics. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on shopify.com, likely to obscure the malicious intent and distribute traffic. No scripts were extracted from this sample.

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=www+seriesflv+net
    • http://files.eatforliving.ca/uploads/1/3/1/8/131871658/6434674.pdf
    • http://files.byrdsworld.com/uploads/1/3/0/7/130775084/gimixupatusopupedi.pdf
    • http://files.tracysteinbrookpaintings.com/uploads/1/3/0/8/130813757/9069702.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/60825182479.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/58967343257.pdf
    • https://cdn.shopify.com/s/files/1/0438/7795/7800/files/fudabowozoxuvexefukate.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/8627846997.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/76960116408.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/fokatexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/nipeduxijulofikimavimuwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3913/6661/files/ritilodoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7356/8919/files/virixerenodanuvopixun.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/mastering_physics_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/23531124648.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_off000051c0.bin
79538500d6e288aad8d14747f7a24e3aac65b219ffac49d8040188adb3cc96a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x51C0 4716 bytes
font_01_sfnt_off000061f3.bin
d817bbe95fab0e39fd2391c8dabcaf8747b9de2ac82f3afaaa270ef1294ac7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F3 15376 bytes