Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b513196536b525…

MALICIOUS

PDF

53.1 KB Created: 2020-10-04 18:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de322a8db0a05c2f6c95c2e3518e8b65 SHA-1: e4fd4816124f5c40562499030ff37d832ddcb408 SHA-256: b7b513196536b52533395f4f19bbea432a2e3353ba39c68b34782935a1b19f54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=iphigenie+auf+tauris+analyse In PDF document text
    • http://files.downtownguestsuites.com/uploads/1/3/1/6/131606901/3296190c5f.pdfIn PDF document text
    • http://dezutol.tonibrannan.com/uploads/1/3/0/7/130739561/2e51de8863.pdfIn PDF document text
    • http://ximul.ebslandscapes.com/uploads/1/3/0/7/130740433/4e2bf2feb06fc6.pdfIn PDF document text
    • http://files.elks1743.com/uploads/1/3/1/4/131437313/cd022.pdfIn PDF document text
    • http://files.outlawyarn.com/uploads/1/3/0/9/130969057/bimabido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/mozogumogenomer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/7267/8054/files/20531079610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0294/3899/files/43905620069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/88655947899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/gidinegekukunisobedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3350/5187/files/38861826394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/36243046863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/red_nose_pitbull_puppies_for_adoption.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4304/8602/files/kovigasutulilalakerubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/holographic_universe_michael_talbot_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3668/9820/files/how_to_draw_comics_the_marvel_way_part_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2630/3134/files/what_is_a_weak_thesis_statement.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8334 4972 bytes
SHA-256: 8e595f7e32eaafa93ea98d6b469e5431d752ceee1293e527816bdb93c5683576
font_01_sfnt_off0000941b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941B 11016 bytes
SHA-256: a523188789bc87a04468813e33cb4948fb6661a5fb50ac375ac63bdd3340a552
font_02_sfnt_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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