Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e983dff1d2c276…

MALICIOUS

PDF

56.5 KB Created: 2020-09-01 03:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb2a2a59df49022868c5fb9f387e402 SHA-1: e03b78be0ffbeae4680320655977987f7d74f343 SHA-256: 37e983dff1d2c2767f860292dff2a1e0679b7be44f8bcaf2352e79a918c3cd2c
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=font+128+barcode+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous other links to static.usrfiles.com indicates a link farm, likely for SEO poisoning or to obscure the malicious destination. The ML classifier 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=font+128+barcode+free
    • https://static.usrfiles.com/ugd/739437_0cf296e9ca644198b4426d8940657abe.pdf
    • https://static.usrfiles.com/ugd/ab922d_b0841f3bf0c9447f842efa36a1f80499.pdf
    • https://static.usrfiles.com/ugd/fb5067_8a7ceac1bf5147658ab620fbac5b5155.pdf
    • https://static.usrfiles.com/ugd/b8c837_acae9f8603aa45ad8ee2cd57f7623b9f.pdf
    • https://static.usrfiles.com/ugd/cd79e3_d01d452c04c24184b44e99ea076f8ffe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/49764843104.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/metodujusaraxebatilim.pdf
    • https://static.usrfiles.com/ugd/097bd5_6f46d25dbbbf489fb596d82bdde9483b.pdf
    • https://static.usrfiles.com/ugd/5b604d_662d826d8f7948afa36cb4d34d6c7600.pdf
    • https://static.usrfiles.com/ugd/d902bb_ce1a626e0e924e4589a1c895aaab9f51.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fcd1461aa6a461e8e594a067697e509.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e543a84ac842c8b8da92c186c818f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1aac5195d7cf4d69be7c52fdcdba263f.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_off00008294.bin
116493a6d24abe082cb5708dc069472a68447d8e5aa13099afc9f604440ef232
pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 5276 bytes
font_01_sfnt_off0000949b.bin
a9fb63a0abab9b04ffffc5cfd32d9e2771d37f445fa8ea5062a09ed9d58cadcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x949B 13244 bytes
font_02_sfnt_off0000bf87.bin
2f9a721647dd746688308b0bec468334c1a6fd8bdadc0967584bb65b1e8ddee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 16196 bytes