Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c2f7d0085162e7…

MALICIOUS

PDF

38.4 KB Created: 2020-08-29 20:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee2ac7bdf25d3533eb423b16fff8db59 SHA-1: 2d459524c78498dc4d0ed560fb465bbe0dbc11da SHA-256: 48c2f7d0085162e74edf0870dc0126f312f4237bb1ee6ce8692a6d29d44ee8a6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a link to an academic PDF. The document body, though heavily obfuscated, contains the same URL and references a PDF topic, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm heuristic further indicates malicious intent to distribute 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=similarities+between+phonetics+and+phonology+pdf
    • https://static.usrfiles.com/ugd/0a0016_32a848b628d24fceb9c67d043ee4bb49.pdf
    • https://static.usrfiles.com/ugd/74c34a_07f56791435b48c4886b3ea95fcf5146.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd5e5bd5997a48e3a133ac60d61edfe9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c41bea29aba489cbd092bdc608078f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f8343cff1d749209f13e85b872057f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f47f62f9f354b58b6213d2f9cf468d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f6d74d10bc47bdb90ccbb503061549.pdf
    • https://static.usrfiles.com/ugd/b8c837_f721d03694f1425494fa6545c4b64ef2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b4e67165c1340dc9c99ea615bc83a72.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd08ae67a8f149e0b08ce56369bc4199.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dfe8f8888b8491f80ea938412e789d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0183fa233b04eaba1a5c57c03c6be3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d3b7603ce94cd786edf732d69ff3ea.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/alter_ego_plus_vk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/create_crystal_report_asp._net_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/scion_tc_owner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/vutazozurexonofasevitunan.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_off00005613.bin
8fc83f13a076600652d703f1fce32d63dbe1384f91d853c3cc9025231a9bbce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5613 6008 bytes
font_01_sfnt_off00006a53.bin
78d1116524aa5edb7e5b622a6a0d336b245915e2feaa264b3662fdd5539b6b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A53 10140 bytes

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