Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbb17e2bd4b6555…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 02:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1598bbbcc39abf142eddce8abde4b77a SHA-1: 5fbef08cbfb05a9892063c98fc463d4bae31a70f SHA-256: 2dbb17e2bd4b6555b388ea427fee488aa5a7bc4801d68375d1fba6b80d64d831
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'aptitude and reasoning questions and answers pdf free download', which is then redirected via the malicious URL. 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=aptitude+and+reasoning+questions+and+answers+pdf+free+download
    • http://files.needahbasket.com/uploads/1/3/0/9/130969985/347af4ab30944d.pdf
    • http://files.headphonerepairhouse.com/uploads/1/3/1/6/131606111/zudejasur-rokezo.pdf
    • http://files.nanditabatheja.com/uploads/1/3/0/7/130739811/norevu.pdf
    • http://files.drsamanthonyskin.com/uploads/1/3/1/3/131383514/bajepenitaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/44028758208.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/sekegogujixabajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/84392924355.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/gamebogibigenasiweparimov.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/kijesariviwamujuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/bawababimozep.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/equivalent_annual_annuity.pdf
    • https://cdn.shopify.com/s/files/1/0432/8993/6025/files/19114478778.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/55968784292.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/tirulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2621/7120/files/nuwave_air_fryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/58461577200.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/35017544587.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d14.bin
0be24c1576bcaeb1030c1dc67621c44250ec92adffa88d2d8ef9cf70ae2848be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D14 5416 bytes
font_01_sfnt_off00007f99.bin
c291a00c5c496116f823e61a8fab517180cbc69c5e296e2f2fb501f703df739b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F99 10196 bytes

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