Malicious PDF — malware analysis report

Static analysis result for SHA-256 12712eb912952262…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b121beb363384403ed0ac8fcb09c7ff SHA-1: 654b6a49a29688805e4b17c73d0953287ecab174 SHA-256: 12712eb91295226213e47d416fffd01e530389c5e89b686b3e4ba8bf4c4bc441
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that aligns with the malicious redirector finding, suggesting an attempt to drive traffic to malicious sites.

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.ru/pify?keyword=undertale+flute+sheet+music+easy
    • http://files.faliselogisticstravel.com/uploads/1/3/0/7/130739247/3199638.pdf
    • http://files.aliciafink.com/uploads/1/3/1/4/131454850/385256.pdf
    • http://files.vivekshah.net/uploads/1/3/1/6/131637239/laropanonele-sapidefiwaji-gijufo-davabosilab.pdf
    • http://files.batholdtimedancers.co.uk/uploads/1/3/2/6/132695455/firinegif_dowejep_nirexipezajuno_kuroburono.pdf
    • http://files.bluebonnetpta.org/uploads/1/3/1/4/131408204/dimavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/fortwayne_craigslist_org.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/vabugumajufavowaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/the_bygone_days_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/32684230216.pdf
    • https://cdn.shopify.com/s/files/1/0430/9788/2773/files/98069655896.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/the_strategist_holiday_gift_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/immunization_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/xavokexatugifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7519/7333/files/executive_cv_template_word_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/english_hd_audio_songs_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee2.bin
c7d29f624cb8e6a36155fcf55d364d0fd458dc328f1ecfb70dd0155bae055ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 5356 bytes
font_01_sfnt_off000070ee.bin
f64f4cdfb645f1329bc147534f84c1cc9c8bad301197e01922f26f230eb34d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 10268 bytes

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