Malicious PDF — malware analysis report

Static analysis result for SHA-256 025e9aba20c92cec…

MALICIOUS

PDF

67.5 KB Created: 2020-07-31 09:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6553594fb632b4ce435cb2f2497012ea SHA-1: 954551c2833b45ba84009b4b60fb88ae525a6ae2 SHA-256: 025e9aba20c92cecfe0f6431cbb48dac369ec6da743bb87acd1bcbb94ce74085
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 strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external 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.cc/pify?keyword=pdf+akuntansi+perusahaan+jasa
    • http://files.evernaturalphotos.com/uploads/1/3/1/1/131163667/javotano.pdf
    • http://files.fccvideo.org/uploads/1/3/1/6/131606552/pajanexixuwe-rasenitilujutox.pdf
    • http://files.julieriveradesign.com/uploads/1/3/1/4/131406344/vumoliro.pdf
    • http://files.awakeningpeople.com/uploads/1/3/1/4/131438899/pebofalebisepo_zugifuvavowa.pdf
    • http://files.judymitcham.com/uploads/1/3/2/7/132712080/f29245457f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1642/1539/files/41445280786.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/50913701761.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/mojikisamewezirawof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/kijagigodinufewenifubizis.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/19219632087.pdf
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/18653924023.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/jogovijigiwigobujolemal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9127/files/sewefaliwunizebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/86909845154.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_off0000cd24.bin
3d94dcd3ebd5ce534d5ff14691e7c403592c818f908f3dadc7c4aa4e646b059d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 5008 bytes
font_01_sfnt_off0000de20.bin
7146097fa963e7011de0a171a6cab2dfb146836822a207877036d71cf85f8cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 10044 bytes