Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88e67403f52b04f…

MALICIOUS

PDF

46.9 KB Created: 2020-07-09 02:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8f73c65ffc0853b241e5320b6ea9a610 SHA-1: 236e3b40274e45b914ba474e06becc06e407e114 SHA-256: a88e67403f52b04f1ceb64b1849d97ca01e759a1fbd1cb745627e22bfb38a5be
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious domains and redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one URL leads to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious content. The document body contains text related to economic data, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=data%20pertumbuhan%20ekonomi%20indonesia%20pdf In PDF document text
    • http://files.freeheartclinic.com/uploads/1/3/0/7/130775744/49298f83004c00.pdfIn PDF document text
    • http://files.bomfitness.com/uploads/1/3/1/4/131438840/butazek.pdfIn PDF document text
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdfIn PDF document text
    • http://files.wbxztv.com/uploads/1/3/0/9/130969405/mawuwi-zulad-bogunan-lezumakowav.pdfIn PDF document text
    • http://files.hussamalghamdi.com/uploads/1/3/0/7/130775751/31b9f3b1a641f2.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lavasotesug.files.wordpress.com/2020/07/mifuvaxonewapisoruremijov.pdfIn PDF document text
    • https://tiwelopo.files.wordpress.com/2020/07/pekunubosafipadu.pdfIn PDF document text
    • https://xuzubika.files.wordpress.com/2020/06/34628537887.pdfIn PDF document text
    • https://pusivogaj.files.wordpress.com/2020/06/rekomowekulikaxenepaburiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000762c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 5332 bytes
SHA-256: 884287846ff605d83a55656e4846053b0408f7783ca67ed1bd92c23b8763ec1b
font_01_sfnt_off00008818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8818 11516 bytes
SHA-256: 61857d8f63345cc3377387d9dc4356c9f3519cc73d6354dfff41931d523bb2f7

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