Malicious PDF — malware analysis report

Static analysis result for SHA-256 029c9bc99777a34c…

MALICIOUS

PDF

39.4 KB Created: 2020-04-04 13:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a10174ef1ebd23460be61338d6a27947 SHA-1: 8311379237b8f6df8a7b7572f83bdf624fb7024a SHA-256: 029c9bc99777a34cf76b2e87745cfda68f9b874d1a31e65112eea40fc926adbb
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDFs, indicating a link farm or SEO spamming operation. The document body, though garbled, contains a URL related to tattoo removal, suggesting a lure to entice users to click on the malicious links. The ML classifier strongly flagged this PDF as malicious.

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://permaculturefoundationofhawaii.com/uploads/1/3/0/4/130475883/130475883.html#how+to+remove+a+permanent+tattoo+at+home+naturally+in+hindi
    • http://tailgatetoday.com/uploads/1/3/1/0/131070236/rubol.pdf
    • http://ryoshinakamura.com/uploads/1/3/0/6/130621020/zuterigari.pdf
    • http://bridgethegapbusinesstrainingsolutions.com/uploads/1/3/0/6/130604240/f9626604713.pdf
    • http://titsandfeet.com/uploads/1/3/0/5/130550969/5ba830cc531fc.pdf
    • http://longislandhandymansc.com/uploads/1/3/0/8/130874248/388c06457e.pdf
    • http://findlayfindsinteriors.com/uploads/1/3/0/7/130740371/kuxumumadegeze.pdf
    • http://deerhavenretreat.org/uploads/1/3/0/7/130739251/notava.pdf
    • http://lbc-events.de/uploads/1/3/0/5/130589145/melapenesixes.pdf
    • http://smallorch.com/uploads/1/3/1/1/131163956/jigunewevogetoluk.pdf
    • http://signsystemstechnology.com/uploads/1/3/0/3/130323290/7d715318891.pdf
    • http://ifixedmywasher.com/uploads/1/3/0/6/130639755/7828881.pdf
    • http://www.mexicandriftchampionship.com/uploads/1/3/0/5/130547846/af73472.pdf
    • http://jacobsenonline.com/uploads/1/3/0/9/130969592/xewufemut.pdf
    • http://wesleykang.com/uploads/1/3/1/3/131384688/2edc1a376f20c4.pdf
    • http://faithful32x32.com/uploads/1/3/0/5/130588230/8806291.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_off00006f39.bin
346ee381feda7b2a6b2e952ee35ebc42b068a5ca23803bb7a2f3b4957863dd90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 7984 bytes