Malicious PDF — malware analysis report

Static analysis result for SHA-256 1408a0b49e20aa67…

MALICIOUS

PDF

40.0 KB Created: 2020-08-03 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52af70d06a52535703d83ad693a40581 SHA-1: 48d2421e5962e33c4b274d79564451d45ce4a5b7 SHA-256: 1408a0b49e20aa6733f03117333b33e616933356de790fd3483d776566b7eeea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is https://ttraff.ru/pify?keyword=english+grammar+tenses+pdf+in+gujarati, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing PDF content.

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.ru/pify?keyword=english+grammar+tenses+pdf+in+gujarati
    • http://files.ameliasclosetfilm.com/uploads/1/3/1/0/131070688/pagebesaxa.pdf
    • http://files.scpwdc.org/uploads/1/3/2/6/132683140/2245369.pdf
    • http://files.artfulbarb.com/uploads/1/3/1/6/131636642/492c8bd77dc.pdf
    • http://files.thomas-lebesmuehlbacher.com/uploads/1/3/1/3/131380871/f66de2f56e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/how_to_use_moss.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48880371243.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7189/files/urc_8820_cisco_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/lawaxiwutezazigunivovel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kurejala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/1699264188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mituvazejuremoposanizama.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/gamitosi.pdf
    • https://cdn.shopify.com/s/files/1/0441/3282/7288/files/75287588899.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.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_off00005e8d.bin
eea1e55e8cb5bb655ab08e2352d4512e2c8d34998b6edc156bb988c279be9d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 5488 bytes
font_01_sfnt_off0000711b.bin
918d3defbb3060124cceca004299397a9f79f6ae9820f4d1c0689cf7f1bf98d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x711B 10016 bytes