Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b04b3310c2241…

MALICIOUS

PDF

39.5 KB Created: 2020-09-05 16:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be0d6f1b76c5ade70b1724da2ec5a167 SHA-1: 486513ecf077077a92b038377c528169e8634ca4 SHA-256: 663b04b3310c22413d665fde6fe7e5b5f0dd91c412a47f43d7c9d085348d3f5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Assentamentos informais em mocambique' and a URL that aligns with the malicious redirector heuristic. The presence of multiple Shopify links suggests a link farm used to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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=assentamentos+informais+em+mocambique
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/74550137213.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/rowowesurorofozofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/1_2_sheet_cake_cutting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5899/files/2x72_belt_grinder_plans_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/84109878157.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/40141065211.pdf
    • https://static.usrfiles.com/ugd/b11f6d_15f9e6232ed74de49b491dc44b006c2d.pdf
    • https://static.usrfiles.com/ugd/599f1c_20591f47e4504e23912d22dd5b3e968e.pdf
    • https://static.usrfiles.com/ugd/fd3290_0289c1ed66334ebc95c40d86c704ec8d.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/seranopafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/balance_de_materia_sin_reaccion_quimica.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_off00005972.bin
c16033250707cb22561acf7e31f850d0e209858313364566d847fa8ed03ac8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5972 5252 bytes
font_01_sfnt_off00006b41.bin
b406a904827da099e1181be7df4817924019f9a34d30e912b23f6182ece1527b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B41 11992 bytes