Malicious PDF — malware analysis report

Static analysis result for SHA-256 832029fe63ebed40…

MALICIOUS

PDF

46.5 KB Created: 2020-08-15 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0ccdcfb40634378fec4b773c790023d SHA-1: 7881639619625482a942f98fa1a775eec2955359 SHA-256: 832029fe63ebed4011acdeed944ab31754893800e948a18625190b57b61bb3c1
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 a redirector service designed to obscure the final destination. The primary malicious URL, 'https://ttraff.com/pify?keyword=bseodisha.+ac.+in+osstet+answer+key', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to exam answer keys, suggesting a lure to trick users into clicking the malicious link. 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.com/pify?keyword=bseodisha.+ac.+in+osstet+answer+key
    • http://files.grahamvangoffrier.com/uploads/1/3/1/6/131606605/3084077.pdf
    • http://lidukuje.sustainableetc.com/uploads/1/3/0/7/130776031/8888030.pdf
    • http://files.wjbands.org/uploads/1/3/1/4/131438234/48d68004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/muledesudeveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/76347087449.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/83476847129.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/hitachi_c10fce2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/88366486031.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/definitive_guide_to_swing_trading_stocks.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/merge_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/burger_king_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/rukawuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/46371843617.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/5559474194.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/the_role_of_secretary_in_office_administration_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/gutoviza.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_off0000697e.bin
efc9faa7c05c100f3dfc4727a14cb9244ce641ca4f1582f21d3160888d3b3359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697E 5124 bytes
font_01_sfnt_off00007aee.bin
dd1a894408ea04b3e31396b8130e9642538eb11d7304e7e7c0be6df97c9e7d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEE 10456 bytes
font_02_sfnt_off00009ea9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA9 4324 bytes

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