Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed530f158341787b…

MALICIOUS

PDF

46.4 KB Created: 2020-07-08 18:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259d55443632fb1a304e75dc47e96f06 SHA-1: 4b66db08197f20962c9e6151a876267dad269de3 SHA-256: ed530f158341787b015f2b013588162fc3ff6393cffb7d31bc8eb111711e59ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of redirecting users to potentially 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.com/wb?keyword=bayesian%20statistics%20peter%20lee%20pdf
    • http://files.bbawakeblogs.com/uploads/1/3/1/4/131437268/66807.pdf
    • http://files.performanceinc.club/uploads/1/3/1/6/131606670/2949269.pdf
    • http://files.bensan.it/uploads/1/3/1/8/131856430/1486217.pdf
    • http://files.spiritualistfellowshipchurchofne.com/uploads/1/3/0/7/130740180/voxuduxepujorujutume.pdf
    • http://files.libbysnaturalsoap.com/uploads/1/3/1/0/131070523/tareluxufawijez.pdf
    • http://files.boaznoy.com/uploads/1/3/0/7/130740493/subakum.pdf
    • http://files.upwardfacinglife.com/uploads/1/3/1/4/131436971/velolerulamur_baxafijirun.pdf
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdf
    • http://files.judicheco.com/uploads/1/3/1/6/131607712/9605056.pdf
    • https://pomufoj.files.wordpress.com/2020/06/32823816698.pdf
    • https://volisavosak.files.wordpress.com/2020/07/71878100898.pdf
    • https://mukabiri.files.wordpress.com/2020/07/gikurilewemegisekomomi.pdf
    • https://bugigos.files.wordpress.com/2020/06/18863639524.pdf
    • https://fijibezuwus.files.wordpress.com/2020/07/68191396634.pdf
    • https://fapepebomev.files.wordpress.com/2020/07/lenamale.pdf
    • https://sizatasuxam.files.wordpress.com/2020/06/wugolofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.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_off0000788a.bin
c2a2657a41b78d4a5000aa1f75023ad5c513467898bf046d4eb3947d97b875ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 4980 bytes
font_01_sfnt_off00008981.bin
b44c63cb77b706a77cbd3cb155ae889d02b38409efc32069757981fc7c6cb110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 10192 bytes

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