Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf43df1a104f975a…

MALICIOUS

PDF

56.5 KB Created: 2020-08-30 10:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311888a435ec6ac9874f459544ec11d8 SHA-1: 57d01537242f553f8a8b17f4c526b83d3391bb8b SHA-256: bf43df1a104f975a94a417c99fbd3fd924df2746f77152473db8ec73b4be484e
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=le+pont+mirabeau+apollinaire+commentaire', which is also listed as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via these embedded links.

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/wix?keyword=le+pont+mirabeau+apollinaire+commentaire
    • https://static.usrfiles.com/ugd/b8c837_38cdd23d8d904530a83b8b277b5e09ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_a21b72bb2cfa43b981a0160bcc6d9be2.pdf
    • https://static.usrfiles.com/ugd/b8c837_71abadd34b074b6fbf1a82c59012821b.pdf
    • https://static.usrfiles.com/ugd/b8c837_842ad55ad2b342c7868fc1d76a677da3.pdf
    • https://static.usrfiles.com/ugd/f63f29_cb438626d38642dd9eb63bca00aa1c16.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/lutipolizotegisajowun.pdf
    • https://cdn.shopify.com/s/files/1/0429/0792/6687/files/filovazedinamuniboke.pdf
    • https://cdn.shopify.com/s/files/1/0441/3338/4344/files/atm_reference_model_in_computer_networks.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/83838500428.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/rosuzigijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4045/6360/files/47873049981.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078bc.bin
be68be67aab95e7781ef1ed25516f3f847268b48caa633a1e3cd099bcf6148e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 4864 bytes
font_01_sfnt_off00008923.bin
e0934895dc66cfbb02b23be0b096216d857ceccb8a7d4e2c3a236124ef00d8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8923 12340 bytes
font_02_sfnt_off0000b023.bin
65a73d1551e59adaeeedec7c3f73bd8f1d28ae5a1abb22f5a67c816fdf5006e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 16088 bytes
font_03_sfnt_off0000c4d2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 4324 bytes