Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3907e4796e59a2f…

MALICIOUS

PDF

39.3 KB Created: 2020-08-12 07:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c3cf4471964d08430d68f7b16c2810 SHA-1: d8f404b66f7cc9cee38d93ab6aa98f2339a1901b SHA-256: e3907e4796e59a2f74b1b4a751d4acf0abd9fb4673c70bce57480bbfd02a7321
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including a critical redirector link to ttraff.cc, suggesting a phishing or malware distribution attempt. The document body, though garbled, contains text related to academic materials, likely a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many pointing to benign Shopify URLs, but the presence of the malicious redirector is the primary concern. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=elementary%20linear%20algebra%20students%20solutions%20manual%20pdf
    • http://files.kpsm.net/uploads/1/3/0/8/130874474/31349.pdf
    • http://kopaxi.annikascaketutorials.com/uploads/1/3/0/7/130739204/danenobeg.pdf
    • http://files.fringeboutiqueto.com/uploads/1/3/1/3/131398000/xedepogozirok-vilut.pdf
    • http://files.fasteddiesworldofspeed.com/uploads/1/3/1/8/131856365/8492d7d1b.pdf
    • http://files.degustationwithoutborders.com/uploads/1/3/1/6/131637362/4335105.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/helm_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jotinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/glucose_biosensor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8188/4067/files/napiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/sublime_sublime_zip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/a_place_called_home_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/kajezajusox.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/tegizofopunafix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/75886020192.pdf
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/online_shopping_awareness.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutowoterefabobenovise.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/27938361761.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/91019851240.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15125842299.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d38.bin
dd59d48961cd98530f633c359d98206289423fda2f4ea0c3e197951c9cf25d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D38 5444 bytes
font_01_sfnt_off00005f9e.bin
3669b27811ff830705639c773f3e3f5d670f912d9ffe5a3f62636141b457e68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 9880 bytes
font_02_sfnt_off0000814f.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 4324 bytes

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