Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8a632216d9ae9…

MALICIOUS

PDF

57.7 KB Created: 2020-08-25 05:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a7fbc66fe18b8dc65392daa2eb5d1e SHA-1: 0c5601979c99353998f251dbae5ec18ada5662aa SHA-256: 7bf8a632216d9ae92b294dc37f1c7025e5f4fd0bd2696295244611b5e3d6423d
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to known malicious redirector infrastructure (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The presence of a "download button" lure further supports a malicious intent, likely to redirect users to a phishing page or download a secondary 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=bseap+ssc+duplicate+memo
    • http://files.joelnrpowell.com/uploads/1/3/1/4/131453061/7be34a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0896/6306/files/2553064380.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/video_editor_free_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/mahabharatham_background_music_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/11239736084.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/77736718969.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/66402988013.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/32044457306.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/saxomorebiwebodir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/tratamiento_de_la_neumonia.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/balance_of_payment_and_balance_of_trade.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000629b.bin
6697eaa99ac4abe2b6916db1d6ab20f563f2040b9614f1972c544e0f0dd09699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 4948 bytes
font_01_sfnt_off00007370.bin
10aa55a44ebcb2773d2f71b0807d69f07410b874e8a1f8b069cb30b2cfda8472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 24328 bytes
font_02_sfnt_off0000a813.bin
988bb2889bd5b4187bd3baeb08d0853a48da9c4422d0f31a02d5caca7f4bd6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA813 10512 bytes
font_03_sfnt_off0000cbda.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 4324 bytes

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