Malicious PDF — malware analysis report

Static analysis result for SHA-256 63044414c641135a…

MALICIOUS

PDF

49.8 KB Created: 2020-03-29 02:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 83d83b2d96d784d3fb45b278fb0d5694 SHA-1: d13fa4f163218df4cfa89dd3ff845988214677e6 SHA-256: 63044414c641135ac9628dd553f02e32aea8ec950fc3e099d8c8bceb3770232a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents hosted on various domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The primary intent appears to be directing users to a network of potentially malicious sites, possibly for SEO poisoning or to serve further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://annotalegal.com/uploads/1/3/0/6/130621995/130621995.html#que+clases+de+raza+de+perros+hay
    • http://gameday.info/uploads/1/3/0/2/130270747/3373219.pdf
    • http://nuheila-art.com/uploads/1/3/0/6/130604449/7999890.pdf
    • http://www.beyond-all.com/uploads/1/3/0/6/130603822/25e18d.pdf
    • http://meadowlarkcafe.com/uploads/1/3/0/5/130540104/6570279.pdf
    • http://blackwaterfire.org/uploads/1/3/0/3/130379711/b58cfa081c9f4.pdf
    • http://mta-sts.mx.michaelclawsontherapy.com/uploads/1/3/0/4/130488829/zatil-gutovazox-sogazo.pdf
    • http://mlselander.com/uploads/1/3/0/4/130436494/lurewik.pdf
    • http://ltylogisticaterrestredeyucatan.com/uploads/1/3/0/2/130287529/jifuwodimoragovufu.pdf
    • http://acadiaextracts.com/uploads/1/3/0/3/130313671/8392555.pdf
    • http://diasporamalivoice.com/uploads/1/3/0/3/130323485/regew_bosuranamiru_ruxujewate.pdf
    • http://www.lehmanathleticboosters.com/uploads/1/3/0/9/130969570/jifuxejisel_nulopugiko_paberizujagixa_jiporipilalep.pdf
    • http://inspiredobsessions.com/uploads/1/3/0/4/130436299/gupej.pdf
    • http://elephantsandchoppingblocks.com/uploads/1/3/0/5/130539287/logafola_kekilejoma_tejemugi.pdf
    • http://mx.yourcareerplanner.com/uploads/1/3/0/6/130603906/megatulu_jemivo.pdf
    • http://musicofpraises.com/uploads/1/3/0/7/130739289/6508819.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_off00009935.bin
fd8ade855a921c6c58ecac1f138a2351bab407ebc40c47fd1d669b9e116422a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9935 8736 bytes

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