Malicious PDF — malware analysis report

Static analysis result for SHA-256 245e284397a11ce3…

MALICIOUS

PDF

32.9 KB Created: 2020-08-21 02:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21d2da9b0828f87dc867272e680b8a90 SHA-1: b1ecdd412823765ad42b878aa9b9d6e6a5daed24 SHA-256: 245e284397a11ce39ad87a408f68098f5c95b40adc328a9d0c91006d4eccba98
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the malicious URL and references to 'begrijpend lezen groep 7 werkbladen pdf', suggesting a lure for educational materials. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the embedded malicious link.

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=begrijpend+lezen+groep+7+werkbladen+pdf
    • http://zanomope.tulalipyouthservices.com/uploads/1/3/1/4/131437605/8754896.pdf
    • http://ridefil.heatherbeardsley.com/uploads/1/3/0/7/130738721/nutinuzidazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1285/7754/files/wake_me_up_when_september_ends_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/mulegilojol.pdf
    • https://cdn.shopify.com/s/files/1/0452/6528/9378/files/75097455744.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/51143671143.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/tiretosuronupakun.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/34368716804.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/81117133959.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/19954077078.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/satijupodejemilulali.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/zunatinawununidit.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_off0000437f.bin
223a2ec8b015d814957a36d96f06ab42ce117be81534cef1834b67c0e2ec517c
pdf-font-stream PDF embedded font (sfnt) at offset 0x437F 5580 bytes
font_01_sfnt_off000056b6.bin
840b95ad1d3860e5c808b694d85fdeee60e697417c8b4eda33139ff49d2e3efb
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B6 9368 bytes