Malicious PDF — malware analysis report

Static analysis result for SHA-256 663367cdd1936c70…

MALICIOUS

PDF

32.3 KB Created: 2020-08-23 00:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d616855ad772d73f4fc7d946dd7c3ce SHA-1: 4d939657878716bbeb7177196dbc4a12b7100b99 SHA-256: 663367cdd1936c70e8f8ea7475b46d3fb8a09e1f0fb87d900d3cbdcccb12976b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic 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.com/pify?keyword=above+demo+font+free
    • http://files.supersonicmagazine.com/uploads/1/3/1/4/131437676/1487835.pdf
    • http://files.alderbowman.com/uploads/1/3/0/7/130775838/29afb62d8cd40.pdf
    • http://kepusu.spcccmacon.com/uploads/1/3/0/9/130968988/fuxililinimux_tuzosiminidabi_fajefoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/7525/1879/files/sintomas_del_cancer_de_piel.pdf
    • https://cdn.shopify.com/s/files/1/0428/3616/4774/files/kukajuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/74865813694.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/zavuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7455/files/high_school_gangsters_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/a_current_affair_reporter_ben.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/xowinasijamogewisuvok.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/61018539915.pdf
    • https://cdn.shopify.com/s/files/1/0433/9318/7989/files/sony_vegas_cracked_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/5795/8299/files/1000_solved_problems_in_strength_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/aneurisma_de_la_aorta_toracica.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000421b.bin
c0d1ad9fb784b66d9d66a570bb06b8f966a4afc2808a0b1c43ac70617004c414
pdf-font-stream PDF embedded font (sfnt) at offset 0x421B 4824 bytes
font_01_sfnt_off00005270.bin
955bae7b8ba3acecb918bed313f33df133c29851caab1894a363c6be3844456e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5270 10028 bytes