Malicious PDF — malware analysis report

Static analysis result for SHA-256 349298a8c796cd70…

MALICIOUS

PDF

48.4 KB Created: 2020-08-14 11:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1bbc6d9939808c82d7ad6ddd2b52d1 SHA-1: 305a3bf51ae4e3c3889375149f29bcd029872435 SHA-256: 349298a8c796cd7095659f999176645e637b1489751ea51755a9556dde73c8e1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text suggesting an academic worksheet answer key, which is a common lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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/pify?keyword=impulse-+momentum+theorem+worksheet+answer+key
    • http://files.graystonecondo.com/uploads/1/3/1/4/131453124/4864385.pdf
    • http://files.espressowilltravel.com/uploads/1/3/1/4/131438604/lesujirubik_dalusakisol_nulobapogoz_fabera.pdf
    • http://files.hicksandsonsjunkremoval.com/uploads/1/3/2/7/132740237/239841f.pdf
    • http://files.wilcox-assoc.com/uploads/1/3/1/8/131856079/4662839.pdf
    • http://files.graystonecondo.com/uploads/1/3/1/4/131
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/12328843244.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/47454499385.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/defawojunanigopejatijupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/47023804347.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/56066725494.pdf
    • https://cdn.shopify.com/s/files/1/0449/1545/8215/files/free_lightweight_reader_windows.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/20691360909.pdf
    • https://cdn.shopify.com/s/files/1/0440/5752/6437/files/basel_ii_bis.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/stepwise_regression_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6437/files/naliferikig.pdf
    • https://cdn.shopify.com/s/files/1/0434/8218/5893/files/pathophysiology_of_restrictive_lung_disease.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000765a.bin
766dfec8b51160b0ceacaf9455b71cf6fc821338668566bf0440cc0e155b6249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765A 1588 bytes
font_01_sfnt_off00007e5b.bin
75dda7ff13a932521fe09ca37898d4cf8deef40e8c46f5f6f6faebc94df676a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5B 5284 bytes
font_02_sfnt_off0000903c.bin
ac0b465af53483e6d58cd89458145b12e8b511a655acb4198701c9a509e0da17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 10428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.