Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d014067989ff8…

MALICIOUS

PDF

53.5 KB Created: 2020-08-14 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0261450c45b86599f6eab2386663cbf SHA-1: ff8d5868772d32a87efc946769edee04ce3162b2 SHA-256: 757d014067989ff80b672196cc5326b01d08ce9156167bbf9907e96558ce13f4
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, and includes a "download button" lure. The ML classifier strongly indicates maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=play+store+apk+file+location, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=play+store+apk+file+location
    • http://files.chautauquacasa.com/uploads/1/3/0/7/130775055/198118.pdf
    • http://files.vickilynnsboutique.com/uploads/1/3/2/8/132816036/e6cb2d18b20f.pdf
    • http://files.curbysickmonedu.com/uploads/1/3/1/3/131383456/ripinawexeve.pdf
    • http://files.tankandhealerstudio.com/uploads/1/3/2/6/132681826/losowobigi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/31306212794.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/tracker._coppersurfer._tk_6969_announce.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/audio_visual_aids_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/homelite_hedge_trimmer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/pajazodufenojuwiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/tamizaje_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0710/files/headspace_andy_puddicombe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/43414562592.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/tixodenuduzen.pdf
    • https://cdn.shopify.com/s/files/1/0440/9524/2392/files/najezexisukefem.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/uniden_dect_6._0_cordless_phone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0537/files/50746213885.pdf
    • https://cdn.shopify.com/s/files/1/0437/8335/6565/files/13367906822.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e2f.bin
1cb33d234f91b1ac5e088666db1ddff3b556278a91c0d23f8f6bcf61bd7a3d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2F 5176 bytes
font_01_sfnt_off00008fe6.bin
e102720ea4810730dbfdb255f191fad41726e6cab18976cf2b3bf2f5b0dcde72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE6 10528 bytes
font_02_sfnt_off0000b3fb.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 16092 bytes

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