Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885dcaa3f16875d…

MALICIOUS

PDF

44.0 KB Created: 2020-10-02 23:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4fba63d4f893a7f9bdeecd285480f3dd SHA-1: 18028dc75e1353d626b2034fb45e95d0ed6fa1e5 SHA-256: 1885dcaa3f16875dba972297a2729b31b4abfad888af81e81bbaee4a964c99d4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains, indicative of a link farm. One of these links directs to known malicious redirector infrastructure, increasing the risk. While no scripts were extracted, the structure and embedded links suggest an attempt to lure users to malicious content, likely as a phishing or malware distribution vector.

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://cctraff.ru/strik?keyword=minnesota+prevailing+wages In PDF document text
    • http://fipewap.usasurvival.org/uploads/1/3/1/4/131407815/kozoleveli.pdfIn PDF document text
    • http://files.6-impossible-things.com/uploads/1/3/0/7/130775346/dotaverexesidaf.pdfIn PDF document text
    • http://nawukaven.sshschoir.com/uploads/1/3/0/7/130775451/2180431.pdfIn PDF document text
    • http://files.headlamhallgolf.com/uploads/1/3/1/8/131856723/9371906.pdfIn PDF document text
    • http://wemurud.mts-wines.com/uploads/1/3/2/3/132302868/mifunofusawexarafi.pdfIn PDF document text
    • http://zatisexat.lovelaughterandreallife.com/uploads/1/3/0/7/130776131/9920680.pdfIn PDF document text
    • http://zuvegar.islandgalting.com/uploads/1/3/2/6/132681352/daserun.pdfIn PDF document text
    • http://notepowuk.linda-daunter.uk/uploads/1/3/1/4/131407406/dipos.pdfIn PDF document text
    • http://files.uniqueintheuae.com/uploads/1/3/1/0/131071180/pukusidenikiw.pdfIn PDF document text
    • https://site-1036898.mozfiles.com/files/1036898/96444961438.pdfIn PDF document text
    • https://site-1038669.mozfiles.com/files/1038669/fewujukejutiwunu.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/duzeboravap.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/1/0437/8954/9729/files/sdsu_spring_2020_class_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1518/6843/files/cognitive_behavioural_therapy_for_dummies_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2499/0363/files/nobodojunatixuvor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/touhou_yukari_wallpaper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3950/1735/files/simplicity_wrap_pants_pattern.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_off00006d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 5144 bytes
SHA-256: c17f1b58393cba59d27ec33ec71b148d0425b983d7ac7e30d181f896e096a1ac
font_01_sfnt_off00007f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F23 10600 bytes
SHA-256: 008e6d400960587b3d1881c32779fe2b36f880d64aa95bf23b48b7f438798883

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