Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea5a3db4a779316…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 12:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae3d0ec81262511e363ccf521d564a9f SHA-1: f718211764e1a03e2bf3544a7787dc4a85b75b87 SHA-256: 8ea5a3db4a7793160b59f75851ec6a533f23ecd2497e86062b1ff8529adfff21
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=intro+to+sociology+giddens+9th+edition', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=intro+to+sociology+giddens+9th+edition
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/overcoming_worry_a_self-help_guide_u.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/58820286934.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/time_warner_cable_pay_my_bill.pdf
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/songbird_fleetwood_mac_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/bimigejewasubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/fedutizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/15213252454.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/vufanazinemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/19632327518.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7095/files/clsi_guidelines_for_antimicrobial_susceptibility_testing_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/chase_freedom_unlimited_benefits_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43692268827.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/examples_of_allegories.pdf
    • https://static.usrfiles.com/ugd/b8c837_91e99408ba1e4e819a71593f890275e5.pdf
    • https://static.usrfiles.com/ugd/0adedf_029994a5cb15436bbd45e5e5bd450118.pdf
    • https://static.usrfiles.com/ugd/136d07_cd1e734558c14a0ea6150ea4e5a37f8a.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_off00004dde.bin
7d912238c04a62cd2a328cf842631970d18ab6ca84c645ecee684218e911d66c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDE 4972 bytes
font_01_sfnt_off00005eb4.bin
49b03465de8182ce03b0c3d3f1def850b8982294e3d9edce7ce4a3b829b0b520
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 9956 bytes
font_02_sfnt_off000080d7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D7 4324 bytes