Malicious PDF — malware analysis report

Static analysis result for SHA-256 1351b627f6a68cb8…

MALICIOUS

PDF

42.6 KB Created: 2020-08-18 16:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155cd57c5f9b2a214cdd8a5ee1f90304 SHA-1: 2f71bb8f95791cb438f5114b3013ba0bf56c8a4c SHA-256: 1351b627f6a68cb8d5f72207ac34ce5b44073d2d10ad2e9a2449b022a232030c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though garbled, includes text suggesting it is a guide for 'Vermintide 2', likely a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=vermintide+2+executioner+sword+guide
    • http://gadigaz.wholesale.fanhubnw.com/uploads/1/3/0/7/130739678/4781079.pdf
    • http://nibeken.itbfm.com/uploads/1/3/0/9/130969465/2592297.pdf
    • http://files.kentaurtw.com/uploads/1/3/1/1/131163738/dusig-kabid.pdf
    • http://files.myfathershouseworcester.org/uploads/1/3/1/3/131379946/11d7caa3fa294d.pdf
    • http://fesen.floridaperimeterbeachrun.com/uploads/1/3/0/7/130776873/2932444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/12077754315.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/the_grand_budapest_hotel_soundtrack_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2017/files/41426193066.pdf
    • https://cdn.shopify.com/s/files/1/0446/7880/7705/files/compound_interest_formula_notes.pdf
    • https://cdn.shopify.com/s/files/1/0446/7779/1897/files/mibudojinoxijivezawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6685/8408/files/72702725465.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/breakpoint_open_beta_cross_platform.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4737/files/roll20_token_size.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/10368023310.pdf
    • https://cdn.shopify.com/s/files/1/0441/3207/3624/files/cours_maths_bac_international_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/bojomusixozapetevato.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/fudiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/periodic_table_ncert.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_off00006702.bin
f3d959131ca1fc0d2f33e5be4d70dda8abad15e6c3dc094186136e0820687adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6702 5272 bytes
font_01_sfnt_off000078ed.bin
5301a10dcc28d94c6759982b0ea39bf84904cf241d3dbde9651174601e9bdf14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 10588 bytes

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