Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4d975fe8b78c52…

MALICIOUS

PDF

41.8 KB Created: 2020-09-02 00:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d940910356f631d1345625e5242aeda8 SHA-1: 6f78402b16a5f25629885da3fe5b7ada0bfdd1ae SHA-256: 7f4d975fe8b78c52fcb815c3f0f26129582220f6e6429c5bfee604f1996efea1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure for users to click through to malicious infrastructure.

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=react+ecommerce+template+github
    • https://demo-react-eco2.herokuapp.com/
    • https://demo-react-eco2.herokuapp.com/admin
    • https://static.usrfiles.com/ugd/cc089a_8b2cdff3627848c0b2dc378f12fd8c57.pdf
    • https://static.usrfiles.com/ugd/ee6770_b73b3fd19048469baaeaaf7e860d9084.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d40a386dc844cdb4fc434921724c2d.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/6928774984.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0463/1802/6917/files/kovebarofus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/94820451569.pdf
    • https://static.usrfiles.com/ugd/b8c837_215ee62a3a1148b38f0730dcae6314dc.pdf
    • https://static.usrfiles.com/ugd/36d413_1d32353a1d71425cb792dfceacf8d4c9.pdf
    • https://static.usrfiles.com/ugd/bb13a2_2ae14ba5b8e44e21856f37da8ef94c79.pdf
    • https://static.usrfiles.com/ugd/24deb6_5ed55d0b527840cea5bd023e4c591c43.pdf
    • https://static.usrfiles.com/ugd/0d002d_ed68cab309064834a63677eba1c557cc.pdf
    • https://static.usrfiles.com/ugd/ca300b_b6cab0232d7942c09f61b2900e63dded.pdf
    • https://static.usrfiles.com/ugd/3826db_ab92f7a295054af1b22e6c51f0e048bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c723ba9a3f5462caa9481fd5195fafa.pdf
    • https://static.usrfiles.com/ugd/07e02c_cc1145756fc24270b6d311191311a2de.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_off00005881.bin
0d7a94c767e4bfda482668dadb9eeb895fafa8b976466f6572356f66838944a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5881 5092 bytes
font_01_sfnt_off000069d0.bin
9a4f5e49cca0d9a7493963796fb228c1c37cd37c852c605474e836fd651a89fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 10064 bytes
font_02_sfnt_off00008c5b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5B 4324 bytes

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