Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc56c1657e7a8af…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 17:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d83c7cbccb238245603c4f89edc56f89 SHA-1: 460a3cc0a812436c66249041baa901c84da52e89 SHA-256: 4dc56c1657e7a8afbdb528e2449730de21ca9d20615e4cd71a33ca7e98dba189
152 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 external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.cc'. The document body, though partially obfuscated, also contains this malicious URL, suggesting the primary intent is to redirect users to malicious content. No scripts were extracted from this sample.

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/pify?keyword=o+que+s%25C3%25A3o+assentamentos+rurais+pdf
    • http://files.thehvbs.org/uploads/1/3/1/4/131452938/pawavagone-bufomuzenijuga-vuvatedovorawa-rupepajozake.pdf
    • http://files.cornerpostcowboychurch.com/uploads/1/3/1/3/131381021/zebedubaxoxu.pdf
    • http://senome.exerciseoutsidethebox.com/uploads/1/3/2/6/132681504/xofuvuve.pdf
    • http://penoxuxu.kensawdustherapy.net/uploads/1/3/1/4/131407089/9448709.pdf
    • http://files.pvpressnewsletter.com/uploads/1/3/1/3/131380889/4986652.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/holy_bible_download_niv.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8083/files/dupulogezanebu.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/waltz_for_debby_cannonball.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/42695500828.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/49153240236.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/all_cricket_rules_and_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/70954050405.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/90698367541.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/xujosimerofegevibej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/11138148524.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/85878041151.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/8238355537.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_off00005ca6.bin
ab129bc4cff0daad876cf965799bb8117d7bb6c95cf5d7a38506c9b219855e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 5508 bytes
font_01_sfnt_off00006eaf.bin
083c24014a6c0a959db9a9b735f791b1b0f764b728ee912b32d02ea55485e07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 12296 bytes
font_02_sfnt_off00009387.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9387 4324 bytes

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