Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deb3b90978dbf2e…

MALICIOUS

PDF

41.9 KB Created: 2020-10-02 21:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1bbbee64d918437acf7c155008c0a04 SHA-1: de5d59cc87bc90d0f6654544120113d1d2d1e13f SHA-256: 8deb3b90978dbf2eeae2cf11077884dc1eafbee4e06a7686d9aac9f15beae0af
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links pointing to various domains, many of which are likely part of a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the one found in the heuristics, suggesting a deliberate attempt to lure users to a malicious site. No scripts were extracted, but the extensive use of external links indicates a downloader or phishing lure.

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.club/pify?keyword=job+duties+of+a+lowes+cashier In PDF document text
    • http://salejojuz.lisayorkarts.com/uploads/1/3/2/7/132740930/rozarujet.pdfIn PDF document text
    • http://files.bansukkim.com/uploads/1/3/0/7/130775682/967a542.pdfIn PDF document text
    • http://kifopuzo.dorippu.com/uploads/1/3/2/7/132740449/40f10.pdfIn PDF document text
    • http://xevuwixag.theartofmonicareekie.com/uploads/1/3/1/3/131381886/folizilozaxa_majenozajugir_kedow.pdfIn PDF document text
    • http://files.kenyeung.org/uploads/1/3/1/0/131069934/8529388.pdfIn PDF document text
    • https://site-1040771.mozfiles.com/files/1040771/73419394157.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/38422239770.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/kivuwuxalogug.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/76645940686.pdfIn PDF document text
    • http://files.ardeasanctuary.com/uploads/1/3/0/7/130738482/tozogovelavoraf_lelaw.pdfIn PDF document text
    • http://vusepa.littlevipschildcare.net/uploads/1/3/2/7/132712115/a9899e3e5e65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9218/3702/files/ultimate_ninja_blazing_apk_mod_2.14.1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7688/8992/files/welcome_to_las_vegas_store.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7373/5330/files/coping_skills_for_schizophrenia.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 5332 bytes
SHA-256: d1cb6f563c048fdfc552680d05f17e532b4a7e46d7b73c96fe85af5c8a30dcab
font_01_sfnt_off00007771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7771 10248 bytes
SHA-256: a240aae5d13b9d0c2396084415e61bbdb3133e20c69599c79081033391667cc1

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