Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9db1ae65e2846d…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 13:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da7f41a7c3c1a86600643309414e2e4a SHA-1: f83a79dcad30c8e7d4406b922631375a34d23fcd SHA-256: da9db1ae65e2846d50c3964d7a3111c4852dba8a9e2e5f3cb2581aab2fe3f6d5
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, pointing to various Shopify domains. One of these links, https://ttraff.ru/wix?keyword=goatee+trimming+template, is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking these links, which then redirect to malicious sites for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=goatee+trimming+template
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/vizovopebetedapiratopase.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/2254796761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/variety_of_living_organisms_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/60808805637.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/nidatijed.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1926/files/grammar_translation_method_journal.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5574/files/jijejeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/assignment_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9920/files/dixenejomiloruxapupugok.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/46914752245.pdf
    • https://static.usrfiles.com/ugd/ba3095_3d6135af920349cf9cb42464a9fae6e0.pdf
    • https://static.usrfiles.com/ugd/ab922d_3c57819d912d487eba8dad4d6e61c8d8.pdf
    • https://static.usrfiles.com/ugd/f6a907_4f4924b587634c298f674966b82b8bdf.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_off000051cd.bin
861f24e25c1d41352e24d84f51aa4650e5e08d5c762bdf51fc16f858fdf629d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x51CD 4992 bytes
font_01_sfnt_off000062b4.bin
ab784a8c7bbadcd03b7a59d2ec80fd15df1028176a48a320c93be5d273566efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B4 10768 bytes