Malicious PDF — malware analysis report

Static analysis result for SHA-256 928711735410ee0b…

MALICIOUS

PDF

46.2 KB Created: 2020-08-23 00:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12027df6aa67064c96b5fdfcce75dca0 SHA-1: 31513895c2ba35d36171e82c2c31c56748f5d88d SHA-256: 928711735410ee0b66decb27571f873c889be91adbc7c15f0aa481c8803a32b0
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, which is also present in the document body. This link, disguised as information about Android Studio, leads to a redirector that likely serves malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. 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.ru/pify?keyword=android+studio+shortcut+to+create+test+class
    • http://files.cliveyou.com/uploads/1/3/1/8/131856331/tegutolej.pdf
    • http://files.kolega-guesthouse.com/uploads/1/3/0/8/130815014/5903636.pdf
    • http://files.lazydoglights.com/uploads/1/3/1/3/131383754/2046363.pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://mizopagez.beardedbomb.com/uploads/1/3/1/0/131070894/tikavoliz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/84106067589.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/63655510618.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/key_and_peele_football_names_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/95115937902.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/72254258851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/5095294091.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/xuxadubadobabum.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/gidamapatofipakus.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/fatibirejazamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/fojekareripufereposupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/anglo_eastern_application_form.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_off00007387.bin
cf3aef836cd33ea6ee08e6c41e8402c168817146c4cde51487fc1537468ea7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7387 5016 bytes
font_01_sfnt_off00008480.bin
7c82d35e9ac200725ace8d4a2159636f08b2e27ca42f42b0c6fbafaa3638f867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 11632 bytes

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