Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87e7a401b15d602…

MALICIOUS

PDF

48.1 KB Created: 2020-09-01 19:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce7c17fc627eb48094f2c87da4bba4b SHA-1: 838b0628256ee8a249778730f9dd5534e758e9f9 SHA-256: c87e7a401b15d602953c131931a5ae61b777c0213dccbf2e6b4940328f3a3491
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to free worksheets. The document body, though heavily obfuscated, contains the same URL. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm. This suggests a social engineering attempt to drive traffic to malicious sites.

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=free+worksheets+on+integers+for+grade+7
    • https://static.usrfiles.com/ugd/87d215_25aa9ec5895d40cf9fa02e301d577a6a.pdf
    • https://static.usrfiles.com/ugd/36f25b_0ae5e7b160e5420387244e23d2c6764a.pdf
    • https://static.usrfiles.com/ugd/d90490_42ab6c3e1be341f097e7fda1d2ad9d19.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/fewijizizawil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/43012724891.pdf
    • https://static.usrfiles.com/ugd/b13fd1_4e7e2ddc7f1d4fab9edb36113e8d7240.pdf
    • https://static.usrfiles.com/ugd/8127dd_e7f5cf0ed95c4d028d43a4ac351812cf.pdf
    • https://static.usrfiles.com/ugd/ab922d_32437e63e3a64ff895c8fc4205c4639d.pdf
    • https://static.usrfiles.com/ugd/51c472_3dcf3af2410f4d288e69ad98cb64d23f.pdf
    • https://static.usrfiles.com/ugd/c1615c_d8b44d4efc094fc5836ac99ea4c4d4c4.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/
    • https://static.usrfiles.com/ugd/ab922d_32437e63e

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d4f.bin
b9532c079bbe0bcd7319c4ea5c9376b360ea6489c6c380d114216902449b16f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4F 5328 bytes
font_01_sfnt_off00008f89.bin
16fe3f7a7ca3ca40f25c2e73a18162838a0b8061de1c5f265e636482502fdbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F89 10500 bytes

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