Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7bbb3852fdd4c2…

MALICIOUS

PDF

40.7 KB Created: 2020-10-05 08:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e595738c2037312e0c9d1551a48d4e62 SHA-1: d9cbfe11bce5e975433e573dc784e441b9e53db3 SHA-256: 0b7bbb3852fdd4c2ec8d9e9cd179792f32ab36faa0f2685e3a35274cd9b8eed7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identified a link to ggraff.ru as malicious infrastructure. The ML classifier also 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://ggtraff.ru/pify?keyword=rhythm+syllables+gordon In PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/befimotumejekexowokitadux.pdfIn PDF document text
    • https://site-1041614.mozfiles.com/files/1041614/vuvudirigojesuz.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/15997266036.pdfIn PDF document text
    • http://files.makersoverdreamers.com/uploads/1/3/0/8/130874283/1118444.pdfIn PDF document text
    • http://files.geraldinecreed.com/uploads/1/3/1/8/131857305/lugulileg-bemupofimujega.pdfIn PDF document text
    • http://nunev.180degreefinancialcoaching.com/uploads/1/3/1/3/131380600/8584392.pdfIn PDF document text
    • http://mubapujo.stmonicasparish.com.au/uploads/1/3/1/3/131380005/turoduvutimefaruwab.pdfIn PDF document text
    • http://senet.neganeon.com/uploads/1/3/0/7/130739169/bf10e246746ebf.pdfIn PDF document text
    • http://files.bec1.org/uploads/1/3/0/9/130969317/zujix-mezin-getiz-fekagexasi.pdfIn PDF document text
    • http://files.chicagocomics.com/uploads/1/3/1/4/131482822/nafawota_numulupujefoja_lubinoxekajap_zulak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0018/8061/files/extra_en_espanol_episode_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1829/7759/files/16326779872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/neverwinter_nights_2_crossroad_keep_walkthrough.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8620/7894/files/blank_2020_calendar_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5289/4874/files/volunteer_position_description_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6000 5488 bytes
SHA-256: 3f436f053fafec0eef1851c41a55fbba576550b68a8650aaf4aed102f73f29b2
font_01_sfnt_off00007283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 9960 bytes
SHA-256: 533472ac0302c962c880eabe7894081ff964a97c8c8b38164f510a8beb3cb0b3

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