Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b79e75453ad5bc…

MALICIOUS

PDF

57.5 KB Created: 2020-08-29 00:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d348afac024c873942f1d8c819688f SHA-1: 272971ed7b1707f1f242212597f09fe5a4fcfa24 SHA-256: e4b79e75453ad5bcc3e0a384d9eb5874ebf14910ec4278b826e4b6bae71a39f6
152 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=plenamente+gaby+spanic+2019, which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting an attempt to distribute malicious content or conduct phishing.

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.me/wix?keyword=plenamente+gaby+spanic+2019
    • https://static.usrfiles.com/ugd/b8c837_2a7a3304c6474d6ca47f26549268ee81.pdf
    • https://static.usrfiles.com/ugd/b8c837_133d4397d13245c8aac7a98d672075fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f994760ee454f9daf7516dd194d8805.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9ba99c7a4b24ae69c9c8d3a7931dd0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_73f27eb718514f14964a172096bfde1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_eab64c9ed9e54033973e97e9cf7650f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce054c7d533441bb908d312701f67b71.pdf
    • https://static.usrfiles.com/ugd/b8c837_aab46271fa4b4c2c8da4aa8f71a5113e.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/geponatorepuzumese.pdf
    • https://cdn.shopify.com/s/files/1/0430/7809/0901/files/gta4_mods_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0437/3266/4481/files/bad_boy_a_memoir_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/latex_two_columns.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/mario_liverani_assiria.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_off0000a191.bin
788d37da030241071f0901701e00fe80b0a1d94854298cb67f2639057adab26a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA191 5880 bytes
font_01_sfnt_off0000b58d.bin
ade98574c9ea5eebb646a7fc299423848b2eecc46f17d7eda3b935f79dfeaf2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 10608 bytes