Malicious PDF — malware analysis report

Static analysis result for SHA-256 401b69fcd78f20fd…

MALICIOUS

PDF

42.6 KB Created: 2020-08-07 14:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef19ce2a3b90776763f68546b36af285 SHA-1: ae9b35d7633722add6c59d24e42278e03e3d20dd SHA-256: 401b69fcd78f20fdd8b0327afaf69ff9f571e0bc5b1b3e20ffd902dec5cf8d78
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. Another critical heuristic indicates a PDF link farm, with many links pointing to shopify.com domains. The ML classifier strongly flagged this PDF as malicious. The document body itself appears to be largely obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm strongly suggest an attempt to manipulate search engine results or redirect users to malicious content.

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.com/pify?keyword=alta+via+dolomiti+5+pdf
    • http://files.interfaithutica.org/uploads/1/3/2/3/132303286/zikibazetajeku-zixewijerobu.pdf
    • http://gapinuk.heatherholistics.com/uploads/1/3/0/7/130775734/2299741.pdf
    • http://jufifoda.pwdchicagoclub.org/uploads/1/3/1/4/131453133/a66bc2.pdf
    • http://vukemum.bespokeoff-road.com/uploads/1/3/1/4/131407263/suvunanon.pdf
    • http://files.y4kc.org/uploads/1/3/2/6/132681891/mufenezilefat_wiwalajedolo_tedefesejukidif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/kikipimuniveforexose.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/ai_machine_learning_deep_learning.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7508/files/tikubuforuvub.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/druid_forms_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/81967155738.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/95553681619.pdf
    • https://cdn.shopify.com/s/files/1/0429/8673/3727/files/tecnologia_blanda_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/repajuwegudut.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/car_wash_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6064/files/3415602766.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/larasojikag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/65349580322.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/98170182543.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/3046410111.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_off000068d5.bin
dc38d415605d61f6a7162f298cb2c9e117deb821eb2f921435b3d11794ef5cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 5088 bytes
font_01_sfnt_off00007a27.bin
02100ae76b4c73ab453f228e6b79602c9e8ece0468fb578b2d20670085d06d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A27 10848 bytes

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