Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a65240b392259…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 16:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a0369d85f0152f141cd7568e45dce3 SHA-1: 20353a57cd21f934f4daa0a265d2f364305fc8bf SHA-256: 7b9a65240b392259e21acfc9ee60d529e79b085236bcea9050f61c41d325c543
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing links to malicious redirector infrastructure and a large number of external links, suggesting a link farm. The primary malicious URL identified is a redirector, likely used to obscure the final destination which could be a phishing page or malware download. While the document body contains garbled text, the presence of numerous external links, including the malicious one, strongly indicates an attempt to lure the user to a harmful site.

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/wix?keyword=walking+with+miss+millie
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/nefatumobuvusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/jivovinoxitulakavesefufar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/9351450618.pdf
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/rate_confirmation.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/big_fish_games_for_android_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/coleman-_mach_rv_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/netbeans_ide_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4953/2057/files/pronoun_and_their_antecedent.pdf
    • https://static.usrfiles.com/ugd/97aff7_ccb7e49cd91b4961a14246d4a06aa96a.pdf
    • https://static.usrfiles.com/ugd/227d0f_09b6119c953745dfbe7cfae2b71e3400.pdf
    • https://static.usrfiles.com/ugd/9cb927_41dae147fc83462fbc8bd63401063279.pdf
    • https://static.usrfiles.com/ugd/086daf_0f8d20a182384f428fb37b20fc2275ef.pdf
    • https://static.usrfiles.com/ugd/b47706_8fe5b0c68c1f44f58b2bb6d631800e89.pdf
    • https://static.usrfiles.com/ugd/b8c837_03fc07f525374df0bcae17c46697bc14.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_off000051a0.bin
561a7df7a5b387727514d60c054ec6ec23fcfe9aaadea308d467c243ef819846
pdf-font-stream PDF embedded font (sfnt) at offset 0x51A0 5172 bytes
font_01_sfnt_off0000632a.bin
496ef0d7fab2ec327c5b206be1977edf2dcda67cd4eea07a3b98cd03f6f187dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 10252 bytes