Malicious PDF — malware analysis report

Static analysis result for SHA-256 53122af533067deb…

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a270bc8961f95ab51ed984aad29851e SHA-1: eb32b7ed53fabc65a0fe5e331f8d75c05ddba17e SHA-256: 53122af533067deb3d65b33004b16e42d6d23e2398cc51c78c7f214cca29dd93
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. It also exhibits characteristics of a PDF link farm, hosting numerous external PDF files. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages. The document body contains garbled text but includes the redirector URL and a Shopify URL.

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=lagu+vremya+i+steklo+505
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/xoremumifekirugenoridoze.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/dewefana.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/39885135330.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/35687620933.pdf
    • https://cdn.shopify.com/s/files/1/0435/1780/4708/files/zanezamafanobumirati.pdf
    • https://static.usrfiles.com/ugd/3794ad_2e06d3e9c578487bb9d7be1e8dcc8c63.pdf
    • https://static.usrfiles.com/ugd/99afdc_a4a09856da8b4d4d9f3940f69fcdecec.pdf
    • https://static.usrfiles.com/ugd/7603ae_73a240e28e21466894b30c7bc9c5b53f.pdf
    • https://static.usrfiles.com/ugd/b8c837_325e306d20584c449a1c3650ac44728e.pdf
    • https://static.usrfiles.com/ugd/b8c837_465b0c3ebe4b43219b3f6ec87d22ccf5.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/zibuket.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/social_work_progress_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/7903/3241/files/email_format_for_business_contract.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/jasmine-_reporters_protractor_example.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_off000050d5.bin
08171c1b1ea51572ce0639449e28ea2719aa8503e207cb4e48ed44492e37ad09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D5 5212 bytes
font_01_sfnt_off000062ab.bin
98e90eb93b0d431618009f663215b7ae9bd3b4eab7580b952947e9f47dce1a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 9884 bytes
font_02_sfnt_off000084c3.bin
0806a063dae257e55426efabbb9660fba5b5d42b93340fcfd2da43185a52e333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C3 16236 bytes
font_03_sfnt_off00009a0b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0B 4324 bytes

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