Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48a6c54bdb05cd5…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 05:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237b7540f699d5d3514d2db8b3b2cbde SHA-1: 37a19554a4df5bf0e28b56630c16701b5567e8f8 SHA-256: c48a6c54bdb05cd5373701a7238e76ae358cff201be1e5fe45ef73fed85f93db
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=gamekeyboard+apk+6.+1.+1'. This indicates a phishing or social engineering attempt to direct the user to malicious infrastructure. The presence of a large number of external PDF links, while many are marked benign, suggests a link farm tactic, potentially for SEO poisoning or to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=gamekeyboard+apk+6.+1.+1
    • https://static.usrfiles.com/ugd/ecec20_072a22068dcc4385ad9f084cd613f4c9.pdf
    • https://static.usrfiles.com/ugd/760101_d1e5c0a826744882b8f8b01d50cbec39.pdf
    • https://static.usrfiles.com/ugd/b8c837_f51ac665798844559ba0fad75a12b8c1.pdf
    • https://static.usrfiles.com/ugd/913720_1cfb6cad07684914906f02f5a628cec0.pdf
    • https://static.usrfiles.com/ugd/eed56f_99604afe0251473f9e83d1f74f518a6f.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/92014477601.pdf
    • https://cdn.shopify.com/s/files/1/0463/3572/1634/files/girl_magnifying_glass_earth_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4455/files/z_notes_biology_igcse.pdf
    • https://static.usrfiles.com/ugd/e02969_a7b5765b529749959c8c7a6e146e2000.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d878a99e694a5d98a201f02f8bfb7a.pdf
    • https://static.usrfiles.com/ugd/7e6083_587b922a01e144908fbfc93235335878.pdf
    • https://static.usrfiles.com/ugd/c618e9_cb6731fb6f8247f48490ce0c33bfb9b3.pdf
    • https://static.usrfiles.com/ugd/33c377_e6a65037449a432f8498dc850153e795.pdf
    • https://static.usrfiles.com/ugd/e78b77_ccc4963329b24503a93373d6e1e9abdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fcb95879de649d8bb2c12d09cf7a545.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_off0000543e.bin
8c82dd0c5dc15da1190e55974ee799f8036972003cf287d431bcf029df0bd1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543E 5024 bytes
font_01_sfnt_off00006568.bin
509cc39abc579687034c818c88230794a0fec931b49d6af43cd0aed5200f4225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 10288 bytes
font_02_sfnt_off0000886f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886F 4324 bytes

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