Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e3bd3b19dd5383…

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 00:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85cfe77c9418feaa4f69d9829e845e94 SHA-1: 126771b985237040b547e8539267fec9d66966a4 SHA-256: 07e3bd3b19dd538383f838a659afe6790c902256370b19b0223bfa8c78ceb58e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The ML classifier strongly indicated maliciousness, and the presence of a redirector link further supports this. The document body text, though partially obfuscated, includes a URL that appears to be part of the lure. No scripts were extracted, but the sheer volume of links suggests an attempt to drive traffic to malicious infrastructure.

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=ereading%20worksheets%20inference
    • http://files.chastrology.net/uploads/1/3/0/7/130775634/9097137.pdf
    • http://files.infantaquaticsct.com/uploads/1/3/0/8/130814288/7487109.pdf
    • http://disageru.kimsplaceco.com/uploads/1/3/1/4/131438464/sadofedobobop.pdf
    • http://files.valentineorthotics.com/uploads/1/3/2/7/132740586/bitavurosa.pdf
    • http://files.customcellardesign.com/uploads/1/3/0/7/130776015/dad77d49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/corgi_tire_machines.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/all_b._ed_college_list_in_rajasthan_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/bajewoxobeviguwozabibikos.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/nukikifedebekavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/boggle_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/butcher_shop_equipment_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/bogazomolebovimikug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/10803983480.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/tedovumeduxenokidupos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/best_reader_for_kali_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/lady_gaga_the_fame_monster_torrent.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000687f.bin
97849cd8c6a0c1b7ee0ba46008ccd4b5ecde7fa85f15173df6acb0f1c21ed2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687F 5364 bytes
font_01_sfnt_off00007ace.bin
5c0a2a4531f930ab71c3106832e1ad8ba03697ef506d11f7d990f99843027a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACE 10036 bytes

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