Malicious PDF — malware analysis report

Static analysis result for SHA-256 900dedbc7895105c…

MALICIOUS

PDF

57.9 KB Created: 2020-08-10 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f50e136eb673373f9c5d17ab9e9ef73 SHA-1: de4979349b7b96bdc8bf375446100edc247ea0e0 SHA-256: 900dedbc7895105c1767b1aa576d0f873b3b64c40f954905e51e892c35abc1db
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary link, 'https://ttraff.com/pify?keyword=telugu+academy+intermediate+zoology+textbook+pdf+download', is identified as a malicious redirector. This suggests the document's purpose is to lead users to malicious sites through a deceptive lure of downloading a textbook.

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=telugu+academy+intermediate+zoology+textbook+pdf+download
    • http://files.mullwildlife.co.uk/uploads/1/3/0/7/130776350/1597936.pdf
    • http://files.apartment-serviced.net/uploads/1/3/1/4/131453919/xegeroniga.pdf
    • http://files.northcentraldocs.com/uploads/1/3/1/4/131453429/53d758a.pdf
    • http://rafoti.metzmachinesllc.com/uploads/1/3/0/8/130874655/simawe_zipegade_joromumedovilif.pdf
    • http://files.custombuilddeckshamilton.com/uploads/1/3/1/8/131871970/6229430.pdf
    • https://cdn.shopify.com/s/files/1/0438/8392/1563/files/tontos_de_capirote_francisco_robles.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/68207948774.pdf
    • https://cdn.shopify.com/s/files/1/0440/6771/7270/files/spotify_ad_block.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/nirosekabapoxuril.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/16130561881.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/chacon_autos_san_antonio_tx.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/55510855992.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/losolutif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/kiginixak.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/software_quality_assurance_milind_limaye_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/tewadosere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/vurogul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab6.bin
15242a061d6e5e12631d6f7ade479cc5867c35649afed5f915e1eee4b0198326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 5760 bytes
font_01_sfnt_off00007e65.bin
e4f4cf6f60d23e733212ab962f8546306d1106613f8c82636f9f2c9feb57b901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 5408 bytes
font_02_sfnt_off00009191.bin
45ab52aa46cbef798171d8aafebf18a09e6e7fdb556f33846f7d1d27d9f5ecb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 16780 bytes
font_03_sfnt_off0000c470.bin
d9b012042df5fe8dc074c42eae0f7627b15178249d85eb70dc7afc452d134ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 16132 bytes

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