Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3cd35b45122d56…

MALICIOUS

PDF

46.9 KB Created: 2020-08-07 13:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae2c77f64b9a13b43bc26472781a0c2 SHA-1: 01bf7f27875360e8e4cc6450a5826764f997d407 SHA-256: 9b3cd35b45122d56975c7e1de8ac4ec95a3f06efa528760635da048db7fcfda8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'payroll management system literature review pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=payroll+management+system+literature+review+pdf
    • http://metixem.sarahdronfieldproofreader.com/uploads/1/3/0/7/130775403/744f9d.pdf
    • http://files.thefishinprison.com/uploads/1/3/2/8/132815003/jozolupofojagi.pdf
    • http://kofiweja.mrsanntutoring.com/uploads/1/3/2/6/132682076/korisanadunogo.pdf
    • http://files.promovershouston.com/uploads/1/3/1/1/131164519/c296105e404.pdf
    • http://files.hopegardencounseling.com/uploads/1/3/1/4/131453823/mufomonizotoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/analgesicos_opiaceos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/6439184002.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mefawubizujoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/vobakid.pdf
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/bicornuate_uterus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6511/files/tuzijajobunurif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/comparison_of_adverbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2363/files/berserk_1997_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/4999/2870/files/hp_deskject_6540.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/bivabawediporomevati.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/74463163848.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/halogenos_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/7916881441.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34996744553.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000790c.bin
5425b53e7ec03a43b43ab76c5545b62a3e981c1189df1424493b189ec218466e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 5616 bytes
font_01_sfnt_off00008c2f.bin
f8e6a66784276402e63f6fa9b18a0e6b76b30707ea6245f77ab9fb71d71c3c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 9956 bytes

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