Malicious PDF — malware analysis report

Static analysis result for SHA-256 7733de92c4affebf…

MALICIOUS

PDF

45.5 KB Created: 2020-10-05 11:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ad8d561fc9abf7014854dba4b59cc0fb SHA-1: 92a448aa1622ac9d24d831d8eeac2ffc2a028463 SHA-256: 7733de92c4affebfeff6ff976c4fb69c14f461f792eef8866e4cff2591cc5495
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to generate SEO traffic, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for users searching for 'earth work calculation in excel pdf'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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/strik?keyword=earth+work+calculation+in+excel+pdf In PDF document text
    • https://site-1042783.mozfiles.com/files/1042783/11738785482.pdfIn PDF document text
    • https://site-1042509.mozfiles.com/files/1042509/91499748796.pdfIn PDF document text
    • https://site-1039802.mozfiles.com/files/1039802/32683817392.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/wisijazetawuziloxegajim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3855/8376/files/avaya_aura_messaging_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2922/9479/files/unblocked_games_66_ez_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/home_alone_3_dailymotion_part_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/buzoveg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/kobiduxow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/51460825362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/mauser_c96_magazine_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1907/4198/files/mass_effect_andromeda_guide_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/no_contaban_con_mi_astucia_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2420/7002/files/gusuguxalepomepas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0097/7829/files/south_dakota_medicaid_prior_authorization_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1338/5635/files/43722521479.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/broward_convention_center_directions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/brown_crested_flycatcher_all_about_birds.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6812 5128 bytes
SHA-256: d4a1bd31333bc79246255afae6e4236a1c692fee7d3c6b25d093762d29fb7f6c
font_01_sfnt_off0000798f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798F 9532 bytes
SHA-256: 79b8eb39f2b978eb31e45e4de821bb352c129883a0fb936ac0a8f5e1144cbc6f
font_02_sfnt_off00009a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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