Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e97f9740924dbb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 22:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ce47d9f707453caf030ae4233a8f50 SHA-1: 61ffb32b995b32e7f31762dead14a12a1cd69ee6 SHA-256: f7e97f9740924dbb3658272f5b9ca3cee48a50e55aafe1e77ffe01a28dcec000
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the primary malicious URL. The primary intent appears to be redirecting users to malicious sites.

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=ffxv+hidden+trophies
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/bososexakujujuzadufitul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/que_son_los_almidones_modificados.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2852/files/vodafone_postpaid_sim_cancellation_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/neuralgia_facial_atipica.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://static.usrfiles.com/ugd/f0f215_d6ee4297519f4e78bd663ee8b4d5c887.pdf
    • https://static.usrfiles.com/ugd/b8c837_aadeb2e488894cd59f939b3042c55c3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bcff15cfa1c4370b1d950ab64693aab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5796/1365/files/receptors_of_autonomic_nervous_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/dativifugedemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6057/files/nezibemaw.pdf
    • https://cdn.shopify.com/s/files/1/0452/6155/3825/files/brown_brothers_harriman_and_co_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/34948647023.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_off00005da9.bin
776dbd4115010cc364cd0b80ac6a4b842cd8b4e00602bc431374564e92a7f85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA9 4760 bytes
font_01_sfnt_off00006dc8.bin
e37fc8471a58b168dd1a48ff67809a60e7e456bb0f5f10b65201cc211dd33298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 10640 bytes
font_02_sfnt_off0000919a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919A 4324 bytes

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