Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c5f92564feb5b5…

MALICIOUS

PDF

51.3 KB Created: 2020-08-18 21:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec5c10e1789bb39cf4bc59e1150f955e SHA-1: 45fa017f470beffc2ef250b582c8071ee023ef60 SHA-256: c5c5f92564feb5b52b7acb220d39c40df9f48a2716b37ad0544f2319809143e2
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a link farm with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.cc/pify?keyword=solving+logarithmic+equations+worksheet+with+answers+pdf, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a social engineering attack.

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=solving+logarithmic+equations+worksheet+with+answers+pdf
    • http://beluje.myptsanantonio.com/uploads/1/3/0/8/130814020/7138036.pdf
    • http://files.ninjamagik.com/uploads/1/3/0/8/130874629/jatupisejumelovavog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/booty_farm_hacked_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1959/files/palefubovenojalofinu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6679/9766/files/xawatew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/30663142782.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1096/files/gebetaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/balance_sheet_format_under_llp_act.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/general_issues_on_environmental_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/fotemuteziweze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7886/0454/files/lujikebomejodumumafuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/7011/9318/files/mogakowitesodabotivilaso.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a6.bin
67c78203e1321752419548d6ad47ee94f22af1ba56e5a97213d032bab8da1a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A6 5896 bytes
font_01_sfnt_off00007a8f.bin
6262aa03e793583886cf61eb5164c910a49ff64a8043970d7423ea1fd1a27f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8F 10016 bytes
font_02_sfnt_off00009d15.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D15 16060 bytes
font_03_sfnt_off0000b1a9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 4324 bytes

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