Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d12a60a547605b9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-07 09:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d423feb6b09bcd0a35720f8457e0488c SHA-1: 73d8e7bd108293498aaa1391b6f8de5fa216b025 SHA-256: 1d12a60a547605b94e2aa4e9ad7cdace942c5863028730a39fd63987be5bf900
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru). The document body, though partially corrupted, suggests an attempt to disguise the malicious intent by appearing as educational content ('Kinds of adverbs worksheets for grade 8 pdf'). The presence of numerous links, including one identified as a malicious redirector, strongly indicates a phishing or redirection campaign.

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=kinds+of+adverbs+worksheets+for+grade+8+pdf
    • http://files.greekworld.store/uploads/1/3/0/7/130775200/tubew.pdf
    • http://files.kitchen2boardroom.com/uploads/1/3/1/8/131857215/sinos.pdf
    • http://files.flblinds.com/uploads/1/3/0/7/130739615/mutuburiliwa-fuzefomo-zuzekovixutus.pdf
    • http://files.iananc.org/uploads/1/3/1/3/131397971/regotovabir-jubub-xofinawadiru.pdf
    • http://files.otterhoundsofoheavens.com/uploads/1/3/1/4/131453100/podajabaraj_xasogox_dibiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0461/5066/files/75810287010.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/gurarakibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/pioneer_fh-_x720bt_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/ncert_exemplar_book_class_11_biology.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/dejalusopofuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1114/files/kufowufupasinutavinok.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/planas_de_vocales_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/95828886327.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/91503884108.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/four_basic_language_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xibazukikamemawamiwemin.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/sony_pxw-_x70_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/aditya_hrudayam_lyrics_in_tamil_format.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_off000068d4.bin
6378ede83fa84f7005d89b0659c1286085752ca18ee94b6c2846b176dc273f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 5788 bytes
font_01_sfnt_off00007c9b.bin
e490e528ce3f366d3ae2471de393c373875a1c85feaa0067ef2eec0b96ec8ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9B 10456 bytes

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