Malicious PDF — malware analysis report

Static analysis result for SHA-256 572d6a8bd82e493c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 02:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e982e992d3f510cdb3981183f555ba44 SHA-1: e81b1fd8b500f2ffba3ae28fc37a9b27162dc8d4 SHA-256: 572d6a8bd82e493c8139981fdb79a300b1834400c6ec82bf42db82345c1667ba
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'manual transmission tips'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, which is flagged as a PDF link farm.

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.cc/wix?keyword=manual+transmission+tips
    • https://static.usrfiles.co
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/gedafamusegujitez.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/ultrapure_phenol_chloroform_isoamyl_alcohol_sds.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/vudiwubebuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/xukizumirakitemifixuxituj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5841/files/galesamonin.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/marine_corps_drill_and_ceremonies_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/24310906536.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/cbse_date_sheet_2020-_21_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/xipibijuguriduvej.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ef48db61934a5e8163bc0ee5d50ce6.pdf
    • https://static.usrfiles.com/ugd/7198c1_11a8dcb8d2da4ca4b1d6f6adafd668be.pdf
    • https://static.usrfiles.com/ugd/b8c837_c888e8bd03584673869bf0b0a5d6cd2f.pdf
    • https://static.usrfiles.com/ugd/d99ef3_ab6d8a2985da41c0a1bcf6f09ee6e505.pdf
    • https://static.usrfiles.com/ugd/b8c837_68d82d63751d4673a654b89ed94a7141.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f46.bin
d0574adf26da9277c55a6dd4e91da62b27602a1f0b9db93c204158eeef11ff2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F46 4972 bytes
font_01_sfnt_off00008016.bin
26a329eae15f59b650f3b603d470be9d7491ba175b4df1d24d0a8997c4a84a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 10228 bytes