Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc1c68485db84bd…

MALICIOUS

PDF

43.7 KB Created: 2020-09-11 21:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358ee76762ac6c28240e10e27e2199ae SHA-1: ea632375a4bc72cdd9530722bb288c930fc73d5c SHA-256: 7bc1c68485db84bdea5929acd5f59a2ae32ba13aa4fa4e17f8fc04ecf2e6c689
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link that redirects to a malicious URL, disguised with text suggesting it is a bus route map. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The embedded URLs suggest a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.me/pify?keyword=bmtc+bus+route+map+pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/new_bodo_dj_remix_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/15370862921.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/ritulokoweloremodavi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/dynamic_calendar_excel.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/d_d_player_s_handbook_4e.pdf
    • https://static.usrfiles.com/ugd/98d639_504e53fd10ed4356ae69e76ca03aa362.pdf
    • https://static.usrfiles.com/ugd/0a51c1_19d736335be44e1995ffe9b0a1be0cbf.pdf
    • https://static.usrfiles.com/ugd/9cc572_871713ef0c0a4dd3af9d8b9c2104a82c.pdf
    • https://static.usrfiles.com/ugd/36d413_169082fe3cc849b99cf0a8583ab01c33.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/principle_of_cavity_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/97727589242.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006295.bin
fdb0bf2c2af1aec28e9e153dcb909cbf625894fddb5a03991d91920209e59d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6295 5456 bytes
font_01_sfnt_off000074ff.bin
19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 1936 bytes
font_02_sfnt_off00007e45.bin
1bc75805293711a9962c67204fee84c3615f8d8ebf86861afcd611c5642e176b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 10528 bytes