Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaa6daaad1d2d0d…

MALICIOUS

PDF

36.7 KB Created: 2020-04-03 05:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 391b4cd466de4f1f7391dcaea915090f SHA-1: 68e6644deeeb772a3761924f5633f1dcde9ea77c SHA-256: 1aaa6daaad1d2d0ddf2f0c9f3e015d4b3568029b1a9a65dacea3cb1190d7884b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body is largely unreadable, but the presence of a link farm is a strong indicator of a malicious intent, likely to drive traffic to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://rockandrowel.com/uploads/1/3/0/6/130639689/130639689.html#conocimiento+cientifico+social+definicion
    • http://dcfchurchftbend.org/uploads/1/3/0/6/130640004/2251222.pdf
    • http://assortedartistries.net/uploads/1/3/0/6/130604456/2024422.pdf
    • http://endofthesearch.com/uploads/1/3/0/7/130774965/1c8e0446191.pdf
    • http://juansjoy.com/uploads/1/3/0/3/130324288/keres.pdf
    • http://movingbackdrops.com/uploads/1/3/0/4/130476346/vizepufatulugo_muluzoko_vatomibadileti.pdf
    • http://freshgearottawa.com/uploads/1/3/0/5/130539658/8568598.pdf
    • http://updatemyaccess.com/uploads/1/3/0/8/130874513/cd9d4f42bb69d27.pdf
    • http://myfirstchicken.com/uploads/1/3/1/3/131380171/897e1c5cef984fb.pdf
    • http://hannahhaleymua.com/uploads/1/3/0/4/130477074/5377243.pdf
    • http://heavenlygeshafarm.com/uploads/1/3/0/5/130541272/00f7a32913.pdf
    • http://choreolab.org/uploads/1/3/0/6/130604225/bunox-ralegerasase-nozodo-nokuzufajajuj.pdf
    • http://centralathletic.com/uploads/1/3/0/2/130270742/3c6cb41de05cc4d.pdf
    • http://peninthehand.com/uploads/1/3/0/7/130738639/raxezewa_wufozewekezetuv_gawomaxo_fuxarimasadi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656e.bin
ed9f8d09c41c3bb086ca7f1f61053b44db895dc56657d17fdf131edd7f3e8bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 8368 bytes

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