Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bfb1b44f051bf2…

MALICIOUS

PDF

48.4 KB Created: 2020-09-06 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29f4a14e6a977823117579ebcd6415c4 SHA-1: 5be42c6fc2ee194b7f532aa13aeadaf7d700ccfc SHA-256: 92bfb1b44f051bf224a785217345480372a735c650bc29cccdde36a211df6245
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=vidmate+mod+apk++install'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, including one pointing to 'https://cdn.shopify.com/s/files/1/0432/5185/9616/files/mawisugubelabilonuvezu.pdf'. The document body, though partially corrupted, contains text referencing 'Vidmate mod apk install', reinforcing the lure. The ML classifier also 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.me/wix?keyword=vidmate+mod+apk++install
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/mawisugubelabilonuvezu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/blouse_designs_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/top_ten_sites_for_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/dim_as_worksheet_excel_vba.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/dugasurekunejifesuwejumom.pdf
    • https://static.usrfiles.com/ugd/54dfea_f39e25348fca4db4a0fe84fb2d0e6a61.pdf
    • https://static.usrfiles.com/ugd/ce5d00_6873fa71c447407bbc263913adcec1dc.pdf
    • https://static.usrfiles.com/ugd/4b68be_7d7c46c113eb4497aa2a0cb890c07a5c.pdf
    • https://static.usrfiles.com/ugd/3d0627_f3e8daa7d306440bb95c3a0b1bbee955.pdf
    • https://static.usrfiles.com/ugd/432b07_647c79d2badd4e4fbe144732a9aa31a2.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5445/files/vapiboza.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/gafako.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2315/files/15701260329.pdf
    • https://cdn.shopify.com/s/files/1/0457/0772/2908/files/2758158971.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/95173471130.pdf
    • https://cdn.shopify.com/s/files/1/0430/2392/5402/files/english_exercises_pronouns_possessive_adjectives.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/73520673710.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/93553604739.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/23245179494.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://cdn.shopify.com/s/files/1/0433/1952/5531/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006660.bin
b5a5ab4e4beeffdd5755f7c3c1668a4dbf0fcd639e575de76e76ceb5da43d81c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6660 5036 bytes
font_01_sfnt_off00007772.bin
722e8105ffb893cf1f2a5c282aa7aa737bfb06394c1071a92febd5c107d252a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7772 10164 bytes
font_02_sfnt_off00009a83.bin
7c79cb96b6f041fc656e90317e2bcbfd8fc0ef0a618a50fe080af43124872ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A83 17564 bytes

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