Malicious PDF — malware analysis report

Static analysis result for SHA-256 b964681662408592…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f468d388d442b501cdf9c00105debab8 SHA-1: ed7fc728c756d52e69da030b0ebba216db9ddf5e SHA-256: b964681662408592ea21d6baba5e0562c9ba2752b0daa801c60ee59fdd8add8f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to interview questions, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO poisoning or distributing malicious links. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=analytical+skills+behavioral+interview+questions+and+answers
    • http://mowizefa.life9rescue.org/uploads/1/3/2/7/132710797/4695171.pdf
    • http://waxavufa.fivesensesmusic.org/uploads/1/3/1/6/131606490/1010046.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/plant_systematics_simpson__1_227.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/64573553561.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/merexibigonewotejetotid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/getting_started_with_spring_framework_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1670/files/wuxusilazopoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7706/files/guitar_chord_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/64858142512.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/aquos_board_pen_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/pulisosawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/maxuzolulidilipabi.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_off00006936.bin
434e6909baaaa74be2fa2b5fa1d41ce04a4ff6bd47f55d797389c1cd4041870e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 5600 bytes
font_01_sfnt_off00007c45.bin
c397f3ad18597f4b0ec937ec00ea28c8c76804128196b69df85c874951463368
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C45 9632 bytes