Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0d8d5216dd4016…

MALICIOUS

PDF

35.5 KB Created: 2020-08-07 08:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3dd4f227e7521a3ddd40a089b6223bd SHA-1: 38943f0fddf8c20096c1ebfb65fadb2f08573e04 SHA-256: 8b0d8d5216dd4016b1ecea424ba9577912187050e4e66e37add36054896baabf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for users seeking specific content. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms a malicious intent to direct users to harmful sites.

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=understanding+comics+chapter+2+pdf In PDF document text
    • http://files.steviesays.com/uploads/1/3/0/7/130776180/712cce6dd2982fe.pdfIn PDF document text
    • http://nodumo.columbia125.org/uploads/1/3/0/8/130874064/kumomikivomebu_berosixed_jinutox_pibigam.pdfIn PDF document text
    • http://files.readingfamilyaid.org/uploads/1/3/1/4/131407571/6acbb31112e1.pdfIn PDF document text
    • http://files.danvillekiwanis.org/uploads/1/3/1/3/131381414/levuxijid-bulefamupi-pazadexupij-nemiruvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/rexapuboraguraret.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/dajutofixut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/daniwuvedotumabasonexevok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/59917811752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6887/3112/files/fofexemimevame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/98580818303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/soxolagaxezeluzate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/48493318210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8415/9903/files/sezapawiwaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridikesomuzumiburowafex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/10044589504.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0B 5660 bytes
SHA-256: 18d2a44d99499e9fa0e04f6376f74ca752d0f3b3e2a481d91f558b245ba0a21b
font_01_sfnt_off0000612c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 9300 bytes
SHA-256: 09f0eddc584a0db82542c6fe184bf6ad80b441ebcd3a4a0436947a39af55f3b6

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