Malicious PDF — malware analysis report

Static analysis result for SHA-256 55607f7c867a6c42…

MALICIOUS

PDF

56.6 KB Created: 2020-10-29 01:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b4b57d1c5a9dae7cdf2972056c1c33 SHA-1: 1c4da0d4ce1d33919cf85c846c22627b3ec771f7 SHA-256: 55607f7c867a6c42c3c25a533388a4a2f9a25679018bd99b4963b07e1819e01f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at 'https://ttraff.me/123?keyword=escalation+protocol+boss+guide'. The document body and metadata suggest it is disguised as a guide or manual to entice users to click on these links. 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/123?keyword=escalation+protocol+boss+guide
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f99da7d4ee37.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f95c3c7deafc.pdf
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f94347e7c05f.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5f99da4723053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisute/sony_alpha_a5100_manual.pdf
    • https://uploads.strikinglycdn.com/files/19e22903-9c89-40e1-a59a-ac58c182a71a/98358299265.pdf
    • https://s3.amazonaws.com/muxegeza/fipilizo.pdf
    • https://cdn.shopify.com/s/files/1/0497/7364/1895/files/supply_chain_management_definition_with_example.pdf
    • https://uploads.strikinglycdn.com/files/65f8f600-100b-4c69-9709-4919474c2b4b/beko_oven_qim223x_manual.pdf
    • https://uploads.strikinglycdn.com/files/f74a88fb-78ba-4bb5-9828-4f0b59441b42/2005_vw_jetta_gls_manual.pdf
    • https://s3.amazonaws.com/niporofez/cellulitis_treatment_guidelines.pdf
    • https://s3.amazonaws.com/felasorarabipis/written_advertisement_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/simpson_variable_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/1ab77c0e-e1f8-4a33-ad7b-ff9c447c9ec4/70058964121.pdf
    • https://uploads.strikinglycdn.com/files/ee541e9e-34ed-47c7-8150-aa622709d7c9/83227447069.pdf
    • https://s3.amazonaws.com/wovitiku/jamonawoxej.pdf
    • https://uploads.strikinglycdn.com/files/cfd8acf1-ff75-44bc-bdbc-d32e40df9bdb/wumatavofeliwasipekapapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/44116713070.pdf
    • https://s3.amazonaws.com/wilugugo/assessment_of_companies.pdf
    • https://uploads.strikinglycdn.com/files/990e4a0b-b37e-4eb9-80ef-d33498462989/kovidawodez.pdf
    • https://uploads.strikinglycdn.com/files/58a16491-b0f5-41f1-ab29-c5bbbb73236a/33865641773.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b083.bin
d99a7ef32162cd4709ef04b50c178d673a151ea6de604ee3491e3dff488cdc0d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB083 21304 bytes
font_00_sfnt_off00007b2f.bin
ceac0eb7b56a20150ce9c3ac48339bfcbcf9ff444945fa32e2119182e6fd707f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2F 5336 bytes
font_01_sfnt_off00008d5c.bin
5e4e8306b1d9c127846af04a26a69f3cb5db1b2fc31bfb53e3622166e298115c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 10172 bytes

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