Malicious PDF — malware analysis report

Static analysis result for SHA-256 2045275895394e80…

MALICIOUS

PDF

40.0 KB Created: 2020-07-30 11:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb87c24d57adc5ba7905eb22020cfe63 SHA-1: 7dbc8dac4e72784f18a5c7b27ebdfcdfa228698a SHA-256: 2045275895394e80fc90ac7b12f45e0110ca573a2459fe4d812f9863139cb505
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, identified as a link farm, with a critical heuristic firing for linking to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=class+specific+character+sheets+5e+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the link farm and redirector strongly suggest a malicious intent, likely for phishing or malware delivery.

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.cc/pify?keyword=class+specific+character+sheets+5e+pdf
    • http://files.vanillabeanonline.com/uploads/1/3/0/9/130969408/mijumigujipow.pdf
    • http://files.danielepiserchia.com/uploads/1/3/1/6/131607407/pafukujuzebix.pdf
    • http://files.onepercentpr.com/uploads/1/3/2/6/132682739/tajosoxelabofu.pdf
    • http://files.mobilespraytanexeter.com/uploads/1/3/2/6/132681740/7b05b2df4b5bed.pdf
    • http://files.boxtermachinery.com/uploads/1/3/2/6/132695574/cf5fcd5.pdf
    • http://files.onepercentpr.com/uploads/1/3/2/6/13268273
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/71941714649.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/33522575406.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/dapegipotatobomixakiwolu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/93839265748.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/45721784358.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/virokopuwiziwinilis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/52346800771.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/fuvepudiguwirovejiwevalul.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/topazeritotikitogagure.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/nokumemoxipiputu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/sativuvibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4551/files/52197050589.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_off00005e68.bin
6898e1877e1e8862dbb0a5ba68ee847d54a260febf5cc1c29d66c9323af48b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 4964 bytes
font_01_sfnt_off00006f67.bin
04d212815f0368a9a49ccabdc6c080f5b7f777fef5d11b965aa6afbc98b503a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 10360 bytes

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