Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f391c7ca7d7561a…

MALICIOUS

PDF

36.0 KB Created: 2020-08-14 09:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3713ef6d2b626caae0dd1e3c016d7e60 SHA-1: e2e9f134fb2e11fc8696fb0a52e8793423a7f219 SHA-256: 1f391c7ca7d7561ac8a4566dfa943730c28271b84abe3420535ca95456593d9d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL https://ttraff.ru/wb?keyword=cen-tech%20cable%20tracker%2094181%20manual, which is flagged as a malicious redirector. This suggests the primary purpose is to lure users to malicious 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.ru/wb?keyword=cen-tech%20cable%20tracker%2094181%20manual
    • http://files.carlock-stpauls.org/uploads/1/3/1/4/131437554/rufebo.pdf
    • http://files.cjbands.org/uploads/1/3/1/1/131163851/loduwebepikebibojesu.pdf
    • http://files.jenniferbythewell.com/uploads/1/3/0/9/130969083/bee6366a471e267.pdf
    • http://files.weenglishpersonalproject.com/uploads/1/3/1/3/131382673/926816.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/declarative_interrogative_imperative_exclamatory_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0437/7110/1346/files/pipe_it_up_clean_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/repumezivile.pdf
    • https://cdn.shopify.com/s/files/1/0450/5898/2040/files/zumegeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/kofofa.pdf
    • https://cdn.shopify.com/s/files/1/0446/9882/8954/files/wwe_enterence_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/92189124234.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/95280435077.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/54128297236.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/39927351602.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/gufotedobesarakenonujos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/vipafapokufakezaruleme.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/hindu_baby_girl_names_starting_with_h.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/talinenawilojikomutepe.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_off00004c97.bin
e487acfc4646208d042f6c7030dd766d4e8ff9256ab4921e6b8c640aa75d8bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C97 5492 bytes
font_01_sfnt_off00005f25.bin
8ea604785d4ed8de69a0913ed25ae658ecc8cb26965a8ba364544c202a7e1fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 10420 bytes

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