Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d173286639339…

MALICIOUS

PDF

53.4 KB Created: 2020-08-02 07:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c6c78f4bdd6188e57ca0b0f68a628f SHA-1: d756bc22d97f36cf8ba5ce17620f8646ad903065 SHA-256: 5a6d1732866393391595fd832974290cd16f177348539f914e0c4576ba34c6a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic firing identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bbg+weeks+13-+24+pdf+free', which is used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=bbg+weeks+13-+24+pdf+free
    • http://files.failedjustice1997.com/uploads/1/3/0/7/130775519/10297a0a0d116.pdf
    • http://files.borough18mc.com/uploads/1/3/0/7/130775221/diravofu_soximanilaxewi_fuxisazowutopo.pdf
    • http://files.familytimefishingcharters.com/uploads/1/3/0/7/130775368/xoxazifebixub.pdf
    • http://files.w4caprinepursuitmininubians.com/uploads/1/3/0/8/130815437/191ddb.pdf
    • http://files.sustainmizzou.org/uploads/1/3/1/6/131606003/werewibaxuzamik-pejononaroge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/toyota_parts_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/nubibawib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5189/0341/files/20273572036.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/zunonigeroke.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/sokukinusow.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/zedezamegalozijuxen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/sudo_spctl_master-_disable.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/how_to_get_discord_partner.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/metuxakuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/rafotulejas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/vovesuresodilukaruj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/88899724887.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000856b.bin
da1cb87d8f682b3c7a3049a2be05535408d37f8760e0c707c2619e529af34a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856B 5224 bytes
font_01_sfnt_off0000975d.bin
6cb239925edda004129387737b19483279877a7ff1cd5ca4c35b80de92840d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x975D 10332 bytes
font_02_sfnt_off0000ba96.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 4324 bytes

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