Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb3fa41feedad39…

MALICIOUS

PDF

47.4 KB Created: 2020-08-20 10:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddfb097cdcf726ec8324a2905f751a2 SHA-1: 87afacbc286b8de7f3a7152d7d68a39cf4e8f7b9 SHA-256: 5cb3fa41feedad398ec63563c37e6f3ee485b5562047fe4a484a4501eb9bce17
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One prominent link, 'https://ttraff.cc/pify?keyword=android+10+devices+huawei', is flagged as a malicious redirector. The document body also contains this URL and other PDF links, indicating an attempt to direct the user to potentially malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious.

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=android+10+devices+huawei
    • http://titozewo.ccsydney.com.au/uploads/1/3/1/6/131636725/nemoponen-todoxibosugama-vatexanojumam-lugugujinebi.pdf
    • http://xamogama.gaofficials.org/uploads/1/3/2/6/132695569/fawulowefadibivuxiw.pdf
    • http://files.bridgit-dengel-gaspard.com/uploads/1/3/1/4/131453850/pekubemepile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/epidemiology_of_parasitic_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/lejeganuduwifalojegiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/34165983326.pdf
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/botany_for_degree_students_by_ac_dutta.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/49515125716.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/69202448842.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/ginavemakanaboresa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/14070542855.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2310/files/metabolismo_del_hemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/101_algebra_problems.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_off00007af3.bin
1061dc9e7ebd764a914fed49e6ef8ec85ee347f7baf78a64d6d2ba4f9c44dbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 5332 bytes
font_01_sfnt_off00008d1e.bin
cb7932390ff932ffb60b16cc68ce60a0e93bf383006bfb55c4ad8c027600ae39
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 10548 bytes