Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a603055c4ccf1c7…

MALICIOUS

PDF

47.7 KB Created: 2020-08-09 18:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04ff6d125a6a0907dea3eb2c82c7a30d SHA-1: 471bf038c6d4c2bbbbd0490b14fcdea0c749adec SHA-256: 7a603055c4ccf1c7bed4c90200ee369f26d767d9c95a5c51c44787db378190e0
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting an attempt to lure users to malicious content.

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=el+acoso+escolar+pdf
    • http://tasigeba.chelseadianephotography.com/uploads/1/3/1/6/131606490/fdf88c6c046.pdf
    • http://files.wbg-bueron.ch/uploads/1/3/2/6/132682093/xuserel-devupaloz-kezubijumo-dezow.pdf
    • http://files.kristinbruni.com/uploads/1/3/1/6/131606395/wevawujok-gapavefevumolo-noditimu-siwaseviwi.pdf
    • http://files.freedom2gait.com/uploads/1/3/0/7/130740483/5133143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7133/0717/files/nirazawulop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/sosolamisudulekijigutapa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5033/4368/files/xekuvepowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/analytical_chemistry_douglas_skoog.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/70522225259.pdf
    • https://cdn.shopify.com/s/files/1/0432/1738/7682/files/surah_al_mulk_arabic_text.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/dodikogikejapoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/11557435761.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/lexonalopinijezorulilimeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/13336155516.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/58929801029.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/kuvaveponolup.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_off000079c1.bin
4beb7123c5be273613a5154638dcbaf4340549da2169512f3fe06691def74d67
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 5108 bytes
font_01_sfnt_off00008b30.bin
7606112e790165df5a555d30ca2f365c586166ab41b39fc46b29818fe2843059
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B30 11368 bytes