Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89bfd7008e328a2…

MALICIOUS

PDF

47.6 KB Created: 2020-08-03 18:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80c31d37df0102c550085c76d827dc8 SHA-1: c22f6dfeaee0612ca25b5bf43e3539602df50b8a SHA-256: d89bfd7008e328a2ac6903b55925255215ff05c4775ce54e7b478f321539ef9d
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/pify?keyword=learn+advanced+excel+free+pdf'. The document body also contains this URL, suggesting a lure for free educational material that ultimately leads to malicious infrastructure. 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.ru/pify?keyword=learn+advanced+excel+free+pdf
    • http://files.tcmattsandsons.com/uploads/1/3/1/3/131384492/monixanibel-jenexurewujep-ninonawuj.pdf
    • http://files.alpinelakes.net/uploads/1/3/0/7/130775228/solit_viwegixu_dixedur.pdf
    • http://files.cowpattiesclothdiapers.com/uploads/1/3/0/7/130776589/manowoxuderig.pdf
    • http://files.southerncrossdrivertraining.com/uploads/1/3/0/7/130739315/1493695.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/terukib.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/taxunelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/temevowafuravamej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/bizewavabigisezajijazux.pdf
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/gafoke.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/22527146301.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/rofidozol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonamov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/wemarosowesusafiga.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/5984475752.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/43218265281.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/gobojuwekanudurixevikeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/nezaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/21122169373.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_off00007ba6.bin
cc09c0052a07b05376fb0f7cd5b4bc568a1e5c321cc65b7aa9dfc7aa33e02459
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA6 5040 bytes
font_01_sfnt_off00008cf1.bin
58d5c11032fa053d6c0153c595e778573b7647f58a79e268289fda5a824ccd22
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF1 10552 bytes