Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ced7f3c4a076875…

MALICIOUS

PDF

44.2 KB Created: 2020-07-31 10:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88be4a910476baee12e1901e943b19d8 SHA-1: 68500ee49524929b92a00114d27836ce957a01fe SHA-256: 5ced7f3c4a0768750907e64b73564011be91fa4ca34f3dba163a7a58093caeb1
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a "Mycenaean greek dictionary pdf". The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=mycenaean+greek+dictionary+pdf
    • http://files.bodypercussionclassroom.com/uploads/1/3/1/1/131164063/cb5658e6.pdf
    • http://files.crownsofgloryw1gs.com/uploads/1/3/1/4/131438819/48e08a2d0de070.pdf
    • http://files.lindsayreissnsf.com/uploads/1/3/2/7/132741194/dixijagaw.pdf
    • http://files.hypnobabiescoloradosprings.com/uploads/1/3/1/3/131383949/salasujugavuzifumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/fugupiwufurirakesajaxewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2762/7164/files/97040252165.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27039997465.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3698/files/62520485769.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/kagumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/zazajovobol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/pobuwefamamineduwosima.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/70544843214.pdf
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/zedog.pdf
    • https://cdn.shopify.com/s/files/1/0441/1277/3272/files/10313149126.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/93509762903.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_off00006fa7.bin
3f1a919d6512cedd658ad1dc5c4c91cf112a6b04cf7057b279a36581ec033228
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA7 5072 bytes
font_01_sfnt_off000080fb.bin
72be92ddc6d57eb3abf3be878ec8ece58b67b2f8fd69ba835782f96c809947a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 10224 bytes