Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc77694fd4cc4d5…

MALICIOUS

PDF

67.0 KB Created: 2020-07-30 03:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b6d6094151be49c1b5a8839829a660 SHA-1: 58c96306ead1aed8511dbc43c7c04ff4d05bb35f SHA-256: 0fc77694fd4cc4d54c3f31b85391fa3449fcd551e4f48e5965a5bf9cded0afce
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This, combined with a PDF SEO link farm heuristic, indicates the document is designed to funnel users to malicious sites. The presence of embedded URLs and a 'download button' lure further supports this attack pattern. No scripts were extracted, but the primary IOC is the malicious redirector URL.

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.com/pify?keyword=ap+grama+sachivalayam+merit+list+pdf
    • http://files.integratedpracticemodel.com/uploads/1/3/1/4/131453588/kajekix-ropolur-dezan.pdf
    • http://files.epc-pcusa.org/uploads/1/3/2/6/132681362/putoj.pdf
    • http://files.leighscateringchippenham.co.uk/uploads/1/3/0/7/130740538/aa326be5eba46c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/10385775660.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/35082819629.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/23071560787.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/pexuzomebogubix.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/nejazatelepototewunuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/lepujuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/67570615069.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/jelina.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/30443839118.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/20979168749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.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_off00007ce7.bin
f6f9557eab6edb2471cf6674157f1c5955ddf6d8b5ce8496efaf607fd5f467d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 5292 bytes
font_01_sfnt_off00008ef2.bin
a7115f026a6aaddb2ba457e0a132e3a56575db7537ce538ae750681f677f44bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF2 18372 bytes
font_02_sfnt_off0000bd07.bin
4d259b481850f78a3f7492f9214e93cccf7f037345983523a350bfd1ad4a5ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD07 11032 bytes
font_03_sfnt_off0000e26a.bin
c9a06cae14aea4a4a64b26bb7a8986360353e4b64a974007e0548dcc54063a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 8076 bytes

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