Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcd1ffcb046808f…

MALICIOUS

PDF

50.5 KB Created: 2020-09-05 12:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8fba25780f36adc359d2ac5effc77b SHA-1: 2234b105670110d34d051894fcceb0833e7642e2 SHA-256: 4dcd1ffcb046808fb2f3e7b2045493448fb51b6d0a971f69d08ef4e12939a8a3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cincinnati bell fioptics speed' and the malicious URL, suggesting a lure for users seeking internet service information. The presence of a large number of external PDF links further indicates a link farm or redirection strategy. No scripts were extracted from this sample.

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=cincinnati+bell+fioptics++speed
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/vepovelafaxiwimosugatiti.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/52498766785.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/dialectic_of_enlightenment_culture_industry.pdf
    • https://cdn.shopify.com/s/files/1/0431/2062/3765/files/the_briefest_english_grammar_and_punctuation_guide_ever.pdf
    • https://static.usrfiles.com/ugd/b8c837_cff675cc254f44c1bde6a67e3e295c02.pdf
    • https://static.usrfiles.com/ugd/0dd040_6eea89ce2234423b89f7ee6d53f0c66d.pdf
    • https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
    • https://static.usrfiles.com/ugd/74c34a_37a61447b6fe4a78ad75ea7f4973c852.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab6f624208d14055b47fa3dfeb5fb1d9.pdf
    • https://static.usrfiles.com/ugd/ee6100_3e62251a12624beaa86656bd8501083d.pdf
    • https://static.usrfiles.com/ugd/b8c837_149928f1bd4a4ddb87ba87799a200367.pdf
    • https://static.usrfiles.com/ugd/08e331_4ca74a4b4ab843a29a280aef72e0e679.pdf
    • https://static.usrfiles.com/ugd/49488e_982e9dd92cde4d5fbe73a7abd722a7ce.pdf
    • https://static.usrfiles.com/ugd/271e65_5f88ef27c40c4b629562324879b239e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_917d8b2a606b423bbe4aa9011b4cbacb.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_e21694c21acf47a4a65ce747885e33df.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_off00006428.bin
f5d79483f0a84c3233184d46af9a491907cfdb5ccc1933e6d6badd184c7d282d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 5096 bytes
font_01_sfnt_off00007588.bin
5bae930e56d0a0b20c281ed5b66a7cd33a397f690f7c7e530c4d9ec049b42ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 16268 bytes
font_02_sfnt_off0000a79e.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA79E 16204 bytes

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