Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf7ee6d7fde1f8…

MALICIOUS

PDF

72.6 KB Created: 2020-08-24 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba3a43802b0fd2ca2ae34585016eb57 SHA-1: c27cc2c725f70a3cdc685a1f57195ba8378f94fc SHA-256: 3cbf7ee6d7fde1f81f793b5289a836fdbf75e89a31a7f409ae678cea1ce85c80
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous links pointing to external PDF files, likely for SEO manipulation or to distribute further malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=stomach+exercise+videos+free, which is a known redirector.

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=stomach+exercise+videos+free
    • http://files.salesismyname.com/uploads/1/3/1/6/131637853/8265428.pdf
    • http://sotipu.amylohr.com/uploads/1/3/1/6/131606069/gamepijoxeve_pujumogova_jarurojot_pugaxutesadag.pdf
    • http://kozoja.holidayrentalsinsurance.com/uploads/1/3/1/0/131070302/fopamixadaxaj.pdf
    • http://files.carsontidwell.com/uploads/1/3/0/8/130814475/gonodoti_kijifosi_wevijilezefelud.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/48832356276.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/clicker_heroes_cool_math_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/napupogabuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/dusanutubojulesefosarip.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/test_file_download_http.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/14246958080.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/2nd_law_of_thermodynamics_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/jejemebugosesanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.pdf
    • https://cdn.shopify.com/s/files/1/0432/7266/7296/files/gumupogaxipum.pdf
    • https://cdn.shopify.com/s/files/1/0465/1198/0694/files/browser_untuk_video_di_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/tepotabajovoxo.pdf
    • https://cdn.shopify.com/s/files/1/0459/9542/5949/files/day_of_the_dead_skull_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/vawegomebomuxagif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d674.bin
99c91e9af8d5ed7133c3083e1fe9283c083cc124ed71cc350d04ef4afe148bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 5460 bytes
font_01_sfnt_off0000e8da.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 1800 bytes
font_02_sfnt_off0000f167.bin
b48909ac29791052c8ed7512c39706b6ca26bee47efca5f609f245bd14f42fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10344 bytes

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