Malicious PDF — malware analysis report

Static analysis result for SHA-256 33999d60ce9dbee4…

MALICIOUS

PDF

49.1 KB Created: 2020-09-18 09:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce488c04c09dfa86ed4c4dcc885ccfcc SHA-1: 238180d6665cac28fe62e4d26c0dadb892b3410d SHA-256: 33999d60ce9dbee48c2887aace21eb9b5826ac52d97250a6674cb6949dbf050c
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised with text suggesting it is an office procedure manual. This is further supported by heuristics indicating a malicious redirector and a link farm. The ML classifier also strongly indicated 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=office+procedure+manual+examples
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/69417115551.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/brandi_carlile_the_joke_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/60901504921.pdf
    • https://cdn.shopify.com/s/files/1/0464/9018/9976/files/cutting_edge_intermediate_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/all_in_one_toolbox_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/psychology_101.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/56046590220.pdf
    • https://cdn.shopify.com/s/files/1/0434/9086/9410/files/maxiscan_ms309_not_connecting.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/gardenline_41cc_petrol_chainsaw_manual.pdf
    • https://a4c7aaa5-2229-441c-a4e0-26383a626555.filesusr.com/ugd/d31907_361928b6927c49c5a5a99d76bbbdf0d5.pdf?index=true
    • https://5722f27f-2e11-4d73-9f0f-7fbff3946bb9.filesusr.com/ugd/a42eed_16a24fd494a1427bbdd75df7d32df553.pdf?index=true
    • https://71e83180-6729-478e-9167-9569e83974dc.filesusr.com/ugd/bc79a4_d80a3040706f424c8370a9b206383391.pdf?index=true
    • https://93905aa8-bb3b-4a80-9588-d6561bfb3c5a.filesusr.com/ugd/fb5067_c290c50df43e4148b426cf990b28d7cc.pdf?index=true
    • https://36238e31-aa96-4cf7-b6d7-659acc325354.filesusr.com/ugd/a891c0_a049453334074517b40d26e62fdb0629.pdf?index=true
    • https://efc990fe-0c59-47e8-88ec-cf812f2f2803.filesusr.com/ugd/5c8b2f_177ee9bb8b294b78b548fb394e9b834f.pdf?index=true
    • https://025dd21c-3e2f-4837-9f5d-8b5d7a59a9c5.filesusr.com/ugd/851c7c_740b3093a48e420b8f08581c19737e14.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007522.bin
341f08e85a43c98992b798b4908459b8df20c539bce30e74ce96c2f88013bd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7522 5200 bytes
font_01_sfnt_off000086b0.bin
3936fb5937e18334706e8ca58d7df30d22853459474bcbfa90de1c24f8b7d841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B0 9964 bytes
font_02_sfnt_off0000a8d4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D4 4324 bytes

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