Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d71448e14c69bce…

MALICIOUS

PDF

58.7 KB Created: 2020-08-14 14:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea1e76719e0f891206e7f2e818542fe0 SHA-1: 0a424568bc89a9e6ea99e307a8cdc2d60e8e4d9f SHA-256: 2d71448e14c69bce19db03285ba4e0767033a989c09a16edf6e75fe23fbcbdc8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic indicates a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Madina arabic book 1 worksheets' and the URL 'https://ttraff.com/pify?keyword=madina+arabic+book+1+worksheets', indicating a lure to download further content. The ML classifier strongly flagged this PDF as malicious.

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=madina+arabic+book+1+worksheets
    • http://files.cryptoinvestmentcalculator.com/uploads/1/3/1/3/131398386/4a2c45a578c32af.pdf
    • http://podibedep.deepgreenbushschool.org/uploads/1/3/1/1/131164250/2679965.pdf
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdf
    • http://files.pawsadventurewalkingservice.co.uk/uploads/1/3/2/3/132303151/tedijitagulelewa.pdf
    • http://xavudivi.nmdnyi.com/uploads/1/3/2/7/132740541/6700393.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7357/files/55489383050.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/pipuzulugud.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/29888953259.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9561/files/wadowajilada.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/30649212434.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/epidemiologia_e_servios_de_sade.pdf
    • https://cdn.shopify.com/s/files/1/0435/4578/8584/files/41588676671.pdf
    • https://cdn.shopify.com/s/files/1/0452/8783/3762/files/human_anatomy_8th_edition_marieb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/20613736917.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7125/files/gijovefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.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
stream_007_off0000b411.bin
21401ac9711a4357514b828b5646580a79ac0f98ead4a2aae75e8d652823ee0e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB411 22620 bytes
font_00_sfnt_off000065bf.bin
94b6648e749c435067e809359c03dceebc28281df86fbdd4ed6636d2b7172c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BF 5348 bytes
font_01_sfnt_off000077f4.bin
96cedaea2146d1a137d3e2c79600fe668aa3b14dde198a1f28c9f78ece9ed829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 6524 bytes
font_02_sfnt_off00008916.bin
c42ad14a314983b013fae0d25f5e2316cf2667d2a9fe8ba75d9f32b5a7e51945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8916 13616 bytes

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