Malicious PDF — malware analysis report

Static analysis result for SHA-256 691bf0859ea4c3c7…

MALICIOUS

PDF

48.1 KB Created: 2020-08-14 19:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b811bfb1f39d0be25ad6ea376a62e1f SHA-1: bae50495a294f513d07ce833cccee54162dca9b6 SHA-256: 691bf0859ea4c3c7e133356f747e2085fd395a2cefa9ee1bb200dfe9f874d29b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, includes a URL pointing to a redirector service, suggesting an attempt to direct users to malicious content. The presence of many external PDF links further indicates a link farm or SEO manipulation tactic.

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/wb?keyword=the%20world%20is%20flat%20chapter%201%20pdf
    • http://vokopubi.dreamcatchermeadow.com/uploads/1/3/0/7/130740257/3963339.pdf
    • http://files.texascityhschoir.com/uploads/1/3/0/8/130873708/tapuzerupis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/juradamikogisamok.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/31953080646.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/lafasanesumiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3436/9438/files/mysql_php.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/list_of_acids_bases_and_salts.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/business_dinner_invitation_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/8461/0712/files/dio_rainbow_in_the_dark_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/wawud.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/70860037111.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/jolonerori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/zafikeloxiludede.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/panolotisiwepexosav.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/windy_escape_pathfinder.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_off00007da0.bin
5821b478fecf978c380813f05d668a57800f085e3a2a868c8fd1ebdb3c88dc1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 5336 bytes
font_01_sfnt_off00008fdb.bin
0bf06970e8fc532530dba37a0b62a8226c44d379838ddbe5dc704beb5b0c0f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDB 10312 bytes