Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f9c1cc57130d43…

MALICIOUS

PDF

38.5 KB Created: 2020-08-24 11:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e57cc814f11b734718c1735fae3d437 SHA-1: 2500a231c7a0a851395e8b16a043624c6b5ac3f4 SHA-256: 65f9c1cc57130d4324f90664b57bc807a951eadd0d445f444505b705df493b2d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the lure for the redirection. The presence of multiple external links suggests a link farm or SEO abuse 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/pify?keyword=angular+material+checkbox+formcontrolname
    • http://nujukuv.lakenonalionsband.com/uploads/1/3/1/1/131163635/sivomodotagikuga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/ruwobeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/global_cfg_igo_primo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/beyond_good_and_evil_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/81121998956.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/zevagabuwewoludate.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/neuralgia_facial_atipica.pdf
    • https://cdn.shopify.com/s/files/1/0439/5266/8830/files/70561475813.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7114/files/16185737725.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/nawoxija.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/ecological_systems_theory_in_social_work.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/35735490355.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_off0000561d.bin
8645efbc1156bea79ec9c55315490e4ccb0f536afdbdc8b63a328274b4666d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x561D 5376 bytes
font_01_sfnt_off0000683f.bin
5fb5c83ea23b5648bc191bd36af6d435449853a8e57bdedce9364b2250245256
pdf-font-stream PDF embedded font (sfnt) at offset 0x683F 10900 bytes