Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf81913bff4e693…

MALICIOUS

PDF

44.5 KB Created: 2020-08-08 05:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aba0b2d734b364eb381d25f52714302b SHA-1: 4020032cecd6f1c121753d4731becf553427dc94 SHA-256: 0cf81913bff4e6931fe08013bfa77e3a675c68be7fc7c03f062a4752cd66e3ed
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'research paper abstract example pdf' and includes the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests SEO poisoning or traffic generation tactics.

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://ttraff.cc/pify?keyword=research+paper+abstract+example+pdf
    • http://files.thelotuscenterga.com/uploads/1/3/0/8/130814032/de9b1545314d147.pdf
    • http://files.nevisatnight.com/uploads/1/3/1/3/131398605/e07e12685f.pdf
    • http://files.stmichaelsnorman.org/uploads/1/3/1/8/131856491/482f6e4cc4198f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/mosoborejuji.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/55256839148.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2784/files/tukowugox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/98976650958.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/zawumugalovifakejigesus.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/bakalitamisotogidetif.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/1021282056.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/kejaxop.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/1300847257.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/rujomosoribaxejugu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7951/4777/files/valelarilogajuxanonemewam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/functionalist_perspective_on_crime.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e41.bin
002af593d2bf80b17a1a83214e1ddc8471357bdfd27198cd12dcc0aadd78476f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 5612 bytes
font_01_sfnt_off0000812f.bin
76edcd27e6f02a8cd5a95aa97795c726cd9e54926a5bafcaa1162428851b4481
pdf-font-stream PDF embedded font (sfnt) at offset 0x812F 10520 bytes