Malicious PDF — malware analysis report

Static analysis result for SHA-256 93979290a97c0072…

MALICIOUS

PDF

35.8 KB Created: 2020-08-30 16:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2896c6b3b332c25092cb97f04a341cc SHA-1: 470f8259198955880f207048ba5f52269a679ae8 SHA-256: 93979290a97c00729287e1a1fa8d512a2c813469a192241964a63b9027437f5c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'rebel without a crew pdf free download' and a URL that matches the malicious redirector. The presence of a link farm heuristic further supports the malicious intent of directing users to external 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=rebel+without+a+crew+pdf+free+download
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/oxford_dictionary_english_to_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/57312233696.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/99398869361.pdf
    • https://cdn.shopify.com/s/files/1/0438/5223/4917/files/1970_corvette_value_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/adobe_photoshop_elements_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/44972409241.pdf
    • https://static.usrfiles.com/ugd/d4da64_44bb0d6fdf894736aac6513b07c69059.pdf
    • https://static.usrfiles.com/ugd/de65f7_4cf7309de43b4b728196ec91ee13ab80.pdf
    • https://static.usrfiles.com/ugd/fd30ac_b0aa81a7922e49919cd4f152924301e2.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0530/files/54469680797.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/89258438192.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/simple_present_tense_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0440/6460/4310/files/kididisefomaxesajixiwaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/99337562084.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_off00004d9e.bin
504ae452fb4f2e70d02f497fd8af57c5274d6eced0fd2416d783a53015850406
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9E 5304 bytes
font_01_sfnt_off00005fb4.bin
f357a3875b67f53553a4e031aa0cbc273b3b47e85072c8f3371adf4ad4d58dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB4 10244 bytes