Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b08807d31b627…

MALICIOUS

PDF

37.4 KB Created: 2020-08-12 09:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf16f36e73b0d2e1f0dd1041b6e8f987 SHA-1: edf5e00735c846052d9a3ecb24aebfe64566c660 SHA-256: cd7b08807d31b6277aee1b8ce00f8ca105092e4af261c5e22ad6f1c7b2831762
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=bauderflex+dna+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on cdn.shopify.com. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be luring the user to click on the malicious redirector URL.

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=bauderflex+dna+pdf
    • http://files.danielhaile.com/uploads/1/3/2/6/132680986/62694efb.pdf
    • http://files.millennial-media.net/uploads/1/3/0/7/130776725/luforugag_wifonexodal_vuzakaluworexe_difel.pdf
    • http://files.sproutlanguagesolutions.com/uploads/1/3/2/6/132681884/6590654.pdf
    • http://files.stephaniemarceau.com/uploads/1/3/0/7/130775102/xejajivaf_ronaposutubunuf_xefolegegul_vibededikaz.pdf
    • http://files.amedicinalmind.com/uploads/1/3/1/8/131871938/votavetinalot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/fogitasegoluje.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/54721937731.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/72442038709.pdf
    • https://cdn.shopify.com/s/files/1/0438/2071/2098/files/finite_mathematics_applied_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/69101531636.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/wovalejulum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/84461081950.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/lafipusu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/webmail_genmills_com.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/5786507966.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/tiwenasok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/bezier_surface.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/vobefazitavodulalitosez.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_off000049b5.bin
0de993b4e86c0f3f1c2e8cf6364f271db1b2c4579561674630cbe0f41f7938ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49B5 4616 bytes
font_01_sfnt_off0000596b.bin
e973f4702f4c4d662d36a621a28723d07d9d15957586ac669e8efafa5f2f033d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 9752 bytes
font_02_sfnt_off00007aba.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABA 4324 bytes

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