Malicious PDF — malware analysis report

Static analysis result for SHA-256 795c15c2a70f37e1…

MALICIOUS

PDF

46.0 KB Created: 2020-08-25 00:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a942f78e6af7d77e1ebdf48061563113 SHA-1: 17783d4162fd740e6eef41a612bc842f031d00a7 SHA-256: 795c15c2a70f37e151bae5ab03167a10f8811a0de4b1d7b771b8843e9f3986d3
170 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'admit card', and the presence of numerous external PDF links points to a link farm strategy. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=admit+card+2018+12th+bihar+board
    • http://lutetefe.bexbourne.co.uk/uploads/1/3/2/7/132712237/f1bde4233dda491.pdf
    • http://files.tinyhamsterpaws.com/uploads/1/3/1/1/131163667/zopenixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/dd_form_2875.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/64768527755.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7670/files/bundesliga_spielplan_18_19.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/21792091858.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/74826502514.pdf
    • https://cdn.shopify.com/s/files/1/0429/6012/6118/files/toropunopumiwupatolisila.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vinupagudesezubinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/fluke_715_calibrator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8681/4109/files/mewugaxomusopokimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/gewedopupurepesofo.pdf
    • https://cdn.shopify.com/s/files/1/0458/1448/1062/files/que_sera_sera_english_song_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000615e.bin
b200633cb5fff7535679a2868fea42ea1beb6d8e42f9c9f2d3087c69578815ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5616 bytes
font_01_sfnt_off00007448.bin
819ce3e826205b78ea9c3274a55bce9fc5b2511f7e6c94e17776c521ded354e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 9960 bytes
font_02_sfnt_off00009691.bin
df8916dc0488248139c8b7f8575cdad52201066875df9eb3f38f8be7ce625b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 16076 bytes

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