Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0efb52a1d261de…

MALICIOUS

PDF

39.5 KB Created: 2020-08-11 03:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fef5c8edaaee5c9546a4fa3db1514f7 SHA-1: 191430160c8a4cda8c06a23b8139b5813389ccb5 SHA-256: 8e0efb52a1d261dea10de3ed915a0cda2504838e3be265e37f138ebea203ed52
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a large number of external links, including a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and multiple URLs, suggesting an attempt to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.cc/pify?keyword=capitalization+and+punctuation+worksheets+grade+3+pdf
    • http://files.majer-holz.com/uploads/1/3/1/6/131637307/xevik.pdf
    • http://mebinagi.kinfolknetwork.com/uploads/1/3/0/7/130776265/vorapirexizosezemiro.pdf
    • http://vudorup.tachyoninc.com/uploads/1/3/1/4/131483083/3ca94.pdf
    • http://files.caseyscurbside.com/uploads/1/3/0/9/130969656/kotow_vebowul_pifojuruvefile_valeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/what_does_efficiency_do_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0434/7304/3622/files/olflex_cable_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/linear_equations_in_two_variable_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/99708394544.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/velitaxixojizuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/how_to_become_a_good_motivational_speaker.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/kojoreriwavep.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/bernard_shaw_arms_and_the_man.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/36949782205.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/64596690265.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/7_wonders_of_the_world_pictures_with_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2023/files/873753102.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_off00004d8c.bin
00643798cf91123f24b0e877a0146009e1ee340b02ab68286143922367be7346
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8C 5692 bytes
font_01_sfnt_off000060ff.bin
2320bcc1ec5979b4b63a2fca238910b5f17d436afc090955a32f32375f4bf744
pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 9880 bytes
font_02_sfnt_off000082c5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C5 4324 bytes