Malicious PDF — malware analysis report

Static analysis result for SHA-256 849c9a36a685117f…

MALICIOUS

PDF

49.1 KB Created: 2020-09-01 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3424c46b9c48a0383d66ec9414210bdd SHA-1: ac67eec8743c8ddf7a284f0f7f6c67d605295d19 SHA-256: 849c9a36a685117f1eb364520d92dc04fe1d5c55b28f13fc1431fbfc5ddfed20
174 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, further supported by the presence of a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=certificate+of+compliance+form+louisiana
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/7ff653_425c2d86f9e4407da6c18ea8877f2947.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a1767b0ebf4c67a7d7807bdf1b2781.pdf
    • https://static.usrfiles.com/ugd/6f53d7_67945b11f9884d3d9a1dba03ac6aa566.pdf
    • https://static.usrfiles.com/ugd/b910ae_20f27716100a48239d2162a00030e150.pdf
    • https://static.usrfiles.com/ugd/67e251_8c59f10d252749f09dc8970adb04e0d8.pdf
    • https://static.usrfiles.com/ugd/225520_0aaa4a135ac24fd481ee6ff5e09e55dc.pdf
    • https://static.usrfiles.com/ugd/136d07_68cc23a9f65d45c292fc842f6c1f1a06.pdf
    • https://static.usrfiles.com/ugd/665c20_a69f523132f6451596a4399c87debfdc.pdf
    • https://static.usrfiles.com/ugd/8b2c09_6620014c0b8b4bccb142a710099c1e55.pdf
    • https://static.usrfiles.com/ugd/06497e_cab3b9ded08d4769a5076be2db004bef.pdf
    • https://static.usrfiles.com/ugd/0d2908_44432f7c04384f0e96ecb5f2916896f0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/jupewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/midas_trend_planos.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006533.bin
21d802b1ddad57ff2dbc5e7fad8049a594dec4727b4894810aea7bfb4c0244fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 5064 bytes
font_01_sfnt_off00007643.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7643 6148 bytes
font_02_sfnt_off00008624.bin
390eec33f7e0e2c33f9f524167934248c84f082528f55c185d856a847e54b52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8624 10076 bytes
font_03_sfnt_off0000a8a6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A6 4324 bytes

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