Malicious PDF — malware analysis report

Static analysis result for SHA-256 9567f4f005e2d7c9…

MALICIOUS

PDF

37.7 KB Created: 2020-08-12 00:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca15aa4ac1554452bb11c39119ca69f SHA-1: 387310b61dbc194e85fb7a063d71fd1a34dae004 SHA-256: 9567f4f005e2d7c90941d064ec830bd49835fe593ff6619755e4f3fce8b7ace9
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to improve search engine rankings, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness.

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=cambridge+english+first+for+schools+practice+tests+pdf
    • http://files.area51scooterclub.com/uploads/1/3/0/7/130740458/japezarurizojadonozu.pdf
    • http://xemikaz.streamatsspp.com/uploads/1/3/1/6/131606260/5526baebce94.pdf
    • http://files.bydesignholistichealth.com/uploads/1/3/1/4/131483214/pewivomezu.pdf
    • http://files.aafps.com/uploads/1/3/2/8/132814593/ede3183.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/michelin_wiper_blades_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/tujivap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/pipijuxoseror.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sekokejeninidifowabofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4919/7472/files/adbwinapi_dll_is_missing.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/mexilawumovorozoxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/vukivizev.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/wordly_wise_3000_book_7_test_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/modad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/comparison_of_adjectives_exercises_advanced_level.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/39919149495.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6326/files/wotesojofuvezekub.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_off0000543d.bin
729121e93647985f2902b2652a17571627586ba229d0ba140179f640115edd97
pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 5612 bytes
font_01_sfnt_off00006721.bin
56fa853bf19bc9fea8fe4d0a9e83b519c476d34cea5ddcd7b164a0177dc26694
pdf-font-stream PDF embedded font (sfnt) at offset 0x6721 10052 bytes