Malicious PDF — malware analysis report

Static analysis result for SHA-256 3930012b6d0b184d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 04:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19822b82a116a7393fca37600e728eb0 SHA-1: 23618c2ded7d7845cf1e513008b515b218b55b79 SHA-256: 3930012b6d0b184d8c9b1127993d42c941d24fa624457eb40676e1a8d87cbc10
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with malicious activity. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.com/wb?keyword=printable%20blank%20periodic%20table%20pdf
    • http://xamin.greatlakesgreatstories.org/uploads/1/3/0/7/130775732/6926377.pdf
    • http://files.simplycheesecakesandmore.com/uploads/1/3/1/3/131384424/9369312.pdf
    • http://zasugema.stonefoxfeather.com/uploads/1/3/1/0/131070493/bogumalagegemimovabo.pdf
    • http://files.ellenbryan.com/uploads/1/3/2/8/132815015/kulonesego_rakovarevipexe_naxomulowepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/gudarunuzutar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/zewutomu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/search_engine_optimisation_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/femevagijonedokepupanes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/21446659236.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/57588025164.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/totesup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/79690403847.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/circular_economy.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/ap_bio_chapter_16_reading_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/carnatic_violin_notes_for_malayalam_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/3241/1298/files/tovepopulodenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.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_off00006184.bin
9b35fd978549f86d2c61edc1daa7a4b30e4679b7510323a216682c903c024dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6184 5176 bytes
font_01_sfnt_off0000731d.bin
1c88b0b910fb15ab0495f674e4e1379b55365de424bb0f0775a458cb2b6c53a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731D 9840 bytes

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