Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f280194321d878e…

MALICIOUS

PDF

46.2 KB Created: 2020-09-02 16:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5742edd9450fa244dbb4ba75589f68 SHA-1: e3ccd3481fb150f0d5a53d660e23601d8ae140ca SHA-256: 2f280194321d878e2200e03f4f205404423287e753ae56b7fc8e6473a16ee591
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body is heavily obfuscated but contains a URL that appears to be part of a link farm designed to generate traffic. The presence of numerous links suggests an attempt to lure 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=guided+bus+route+cambridge+timetable
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/lasexomujaponigip.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0591/files/escape_room_answer_level_80.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/73875984061.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/saxuzar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5232/7324/files/ankush_lamba_puzzle.pdf
    • https://static.usrfiles.com/ugd/f35da0_8cbae62c168e4c09873454ae343a5a3a.pdf
    • https://static.usrfiles.com/ugd/f8de3e_3d37e3f6646b42968f0f7e90271a1e14.pdf
    • https://static.usrfiles.com/ugd/6dcf04_5711c1979f0e408388f5758a0beb7451.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef6a5554ca4744a995576b1ca1b073ef.pdf
    • https://static.usrfiles.com/ugd/7598fa_d7f8f0a612bf4580976d4005b2c81114.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/glistering_melon_slice.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/89269702810.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/multimedia_player_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/inorganic_chemistry_principles_of_structure_and_reactivity_huheey.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/doute_sceptique.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_off0000693a.bin
0c2ced108054d25b49640926bef0ad24df6e0776af6810079439c0e41813bb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 5428 bytes
font_01_sfnt_off00007b8e.bin
647df1cbb7984720b0d9649e081555bf8b874dce4d580a3927de1bd3e349366e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8E 2240 bytes
font_02_sfnt_off000085a6.bin
5e6d52c332d43f7eb6a0eb78930ebbdc3a149cddd4a13d8418f30cc1354f032b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 10396 bytes

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