Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3c159dcf74896c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 14:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7029af10a5c65619aba5ed42eaee31 SHA-1: 1cf628bf70d5b914da4e74830ff9a883d25ab916 SHA-256: 4f3c159dcf74896c41d1e219f320ed5142f8c837d638cd5a37ef96beaca98275
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text, though partially corrupted, includes the phrase 'Big bang theory essay pdf' and the malicious URL, indicating a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=big+bang+theory+essay+pdf
    • http://kizilusuj.northstarmusicak.com/uploads/1/3/0/8/130874422/615112.pdf
    • http://files.canyons-ea.org/uploads/1/3/0/7/130775952/gituwuwefi-bogav-kulig.pdf
    • http://files.leadersaliveintl.com/uploads/1/3/1/3/131380786/1091201.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/83005554741.pdf
    • https://cdn.shopify.com/s/files/1/0428/6873/6166/files/16753768111.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/example_shading_answer_sheet_for_let.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/29789550520.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/26490672881.pdf
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/cambridge_latin_course_book_1_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/davumitifere.pdf
    • https://cdn.shopify.com/s/files/1/0446/4685/8915/files/36500476091.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/wuxakob.pdf
    • https://cdn.shopify.com/s/files/1/0451/3467/6133/files/design_thinking_process_and_methods_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/17022962708.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/veludagidigube.pdf
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/56325496157.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/10248532555.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_off0000675f.bin
aca7e4b793166a537a2f1097eebac827fd414e189cee5ff8c531c2ea565f75ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675F 5564 bytes
font_01_sfnt_off00007a40.bin
fc32c413ba1e9bf87ba7250b6eeacca000ddcf9de81494843c1612e2f681a7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A40 10128 bytes

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