Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c5da0e7212d94f…

MALICIOUS

PDF

73.0 KB Created: 2020-08-30 17:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dfebe622cb023065cc6e15366c6b733 SHA-1: 71885be7ff4b33b088535b4f294429388fe5d31b SHA-256: 79c5da0e7212d94feee7c0a55b1645c3ca8fd4ce4a3d934a36e58cf253e30a74
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded external links. One of these links, 'https://ttraff.cc/wix?keyword=the+pianist+wladyslaw+szpilman+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect 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/wix?keyword=the+pianist+wladyslaw+szpilman+pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/53481351676.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7888/5280/files/60455066734.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/tifezasusutogepem.pdf
    • https://static.usrfiles.com/ugd/b8c837_efaacaa5e8d147eca01cd6c3f4c7b35a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e866402209b4a83b948a68f0bf0a07d.pdf
    • https://static.usrfiles.com/ugd/4c1554_bac78238362947429d78db3b1f6359ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceefa6617de046cab9af5e0a9b652215.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/legitazupesuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/vesaretibisexogumavanoko.pdf
    • https://cdn.shopify.com/s/files/1/0450/8162/4739/files/bilingual_education_an_introductory_reader.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_off0000e199.bin
dfbbeb1d6f76fc50219e41e7479cf3f3481619a873ca3f1d01d55130a8494f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5376 bytes
font_01_sfnt_off0000f3de.bin
3df206481748d4f742e0a69bb397e15f094dc5fa759de2d595e592a6f7f9b15c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10388 bytes