Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a2888accb2ccaa…

MALICIOUS

PDF

44.1 KB Created: 2020-07-29 14:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e2f162a20330b19041cfdf28c98187 SHA-1: e8006238b9a848b1923feae96634e6a5f8ae8446 SHA-256: 15a2888accb2ccaa52b9c3d293ce19c2f4083acff9292b92f4cb7c56c1150005
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document with high confidence. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.ru/pify?keyword=biji+apomiksis+pdf
    • http://files.masstec.org/uploads/1/3/2/3/132303138/tatiraxeno_gupukitekezev_japawibe_zenanotozerepet.pdf
    • http://files.absolutelyfabulousfashion.com/uploads/1/3/2/7/132710783/vawojuriniba.pdf
    • http://files.annemudge.com/uploads/1/3/0/9/130969939/5b0e299dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0953/2323/files/weviwalugiziwok.pdf
    • https://cdn.shopify.com/s/files/1/0429/8758/5699/files/63148637605.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/39590729866.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/siparitew.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/36725234070.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/xixopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/7934438377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0186/1528/files/8276488181.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/51137540912.pdf
    • https://cdn.shopify.com/s/files/1/0438/8693/6219/files/21507494376.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/kuxafokexovapivalegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/dowam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6143/files/83114859499.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/32211903967.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_off0000726f.bin
fea3fd07c677d14ac182200f9798c35a9c9f0e23b909fd7c820014e32e9ae411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726F 4732 bytes
font_01_sfnt_off0000827e.bin
974474e751d1b3d66eedc28f60f64711ec40bf899caaaf1982d09ea60a57e3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 9708 bytes

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