Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4336eb49088e7b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-08 20:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce08f7ac9ddf01a52cf3f68a1c31aca9 SHA-1: 52e0afcdb7e9a1d203eedfd185a7af1fdf83f2d3 SHA-256: ec4336eb49088e7b46e507b75f63b9bf87b21741ff1e85349679b44ca6284189
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a primary link pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to book translations and the PDF creation tool, likely serving as a lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

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.ru/pify?keyword=terjemahan+kitab+bidayatul+mujtahid+pdf
    • http://files.nwosciencefair.ca/uploads/1/3/0/9/130969352/4643453.pdf
    • http://zepujum.karhongtextiles.com/uploads/1/3/1/0/131071164/denijofe-davisesoziwep-nojajoxomanure-dapujowu.pdf
    • http://files.packmeinursuitcase.com/uploads/1/3/1/6/131606366/d791f3a.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/mevurikusasunefijer.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/gawajeto.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/save_figure_matplotlib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/63004386302.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/2566740277.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/kabarakawovoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/49167838054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/63819162435.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/virgil_aeneid_latin.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/1221915588.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/gijifofiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/zigodose.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/ultimate_guitar_chord_chart_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin
6b432760809a57cc38826132e61c787b678ebec22dcb16705275cea6bc5e2152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5436 bytes
font_01_sfnt_off00007924.bin
91e751e4f62b339de9fe96cd9195baf8b5913f1793c088630876fcbe0c5f3660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 10064 bytes

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