Malicious PDF — malware analysis report

Static analysis result for SHA-256 e338e72e5e84febe…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 16:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a00d634e076a73524dcbf9364aea653 SHA-1: 6fa6553aa0f6bb82a38923ca90fea2690d1edc68 SHA-256: e338e72e5e84febeacdb6515477fa3567c08081be717356458c139f63f9bb864
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The presence of many Shopify links suggests a link farm SEO tactic to obscure the true malicious destination. The ML classifier strongly indicates maliciousness.

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.me/wix?keyword=alfabet+grecki+wymowa+pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/nezowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/napimimenuxiderisefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/89836732032.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6071/files/morbus_bechterew_ernhrung.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/html_form_method_default.pdf
    • https://cdn.shopify.com/s/files/1/0437/3620/3415/files/3_minute_testimony_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/18298129710.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/kipotosabixupigosazovawib.pdf
    • https://cdn.shopify.com/s/files/1/0458/0992/6310/files/jadawilapubakawasolakosiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/fovis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/30043394949.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/xataruxepifun.pdf
    • https://static.usrfiles.com/ugd/b65acf_f1467651991d4533b996b8f845da7b90.pdf
    • https://static.usrfiles.com/ugd/cdb50c_a19a82a07d6f4397a91ea97dc02246e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_09334912cfe84fe58a2eb31cacd0fefb.pdf
    • https://static.usrfiles.com/ugd/3f4b99_086875067aa84df38bc788eab087f3e4.pdf
    • https://static.usrfiles.com/ugd/c068f8_c14f3931840e48f783da5950bac90967.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_off000061a8.bin
47ee745f3b1f9ca9387155c6e6464932dcb9760b5d0decb2776d5f35aee4a5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 5684 bytes
font_01_sfnt_off00007510.bin
6ce38666358d2617cb23e98fca2c39a81bb24133b1c85458f6fe77e14b2d7562
pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 20024 bytes