Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d3ec0b5e54182a…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a6e1f93d3f10880d7afb8cbe2b58ed SHA-1: 2edebcb4339074f4709283c9d995ab39c59f3e81 SHA-256: 35d3ec0b5e54182a0bff6d76feb7ed7ae513dc885f0656fc1c8df9683fe6502e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a download for "Rascal flatts what hurts the most mp3 download 320kbps". The document also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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=rascal+flatts+what+hurts+the+most+mp3+download+320kbps
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/87122100491.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/74044293287.pdf
    • https://cdn.shopify.com/s/files/1/0463/1468/4578/files/apple_iphone_4s_antivirus_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/betunikuluka.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/gepogejosadoguxeweluzuge.pdf
    • https://static.usrfiles.com/ugd/b8c837_99498311b6fe4177a52bf326ed73f1b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e808c1dbe184be5a153578435ff41de.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6bda7af1f449e880e4ca11bba2ed33.pdf
    • https://static.usrfiles.com/ugd/b8c837_7961dce88cb14d47a25e91ce0e8f8a1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a09fb0777114416b30e48b8fba6989c.pdf
    • https://static.usrfiles.com/ugd/ace02d_9a29a4b877f34f7091ba5d282b72f8e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_26cc499ca283404f82a3a6fd1d78947c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4509acb56e04908976b8183ea8eabd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d928d30a28b4f8c87529791b03cfff4.pdf
    • https://static.usrfiles.com/ugd/80c1db_4028918c55744d248e87d7a62acf3a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_35d44c59c529476e80f9d841938486a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b220411403f4368be8949c1a6219aab.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_off00004e9c.bin
aa5372358103b7cc4ef908374b598f052ee1396b52dcf70fa50afca2ab89f292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9C 3036 bytes
font_01_sfnt_off00005bae.bin
d8d0aa1698482455a253685f8c1b2664ac0053fce92418e98fe3e96d8b157e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAE 6136 bytes
font_02_sfnt_off00007071.bin
671a4fe48298d70ad236b67f3ec338cf07f46eeb4b5aaa0380cffacb905cdf75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 14532 bytes

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