Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff718f2e060eee10…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 15:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb677ed13770b10f78251fa3732ee7a SHA-1: be4fb807cd9ec1d7bf7d52dc013a28a716b97051 SHA-256: ff718f2e060eee10ee1ea820c4b8a7ed4d07e751ef39b2adc735ac25e38b67cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains text related to 'chargeback response letter template' and the malicious URL. This suggests a phishing attempt to lure users to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the final destination.

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/wix?keyword=chargeback+response+letter+template
    • https://cdn.shopify.com/s/files/1/0434/8510/2237/files/90086177020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/80607063658.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/xukokowatogopokimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0170/files/duzajoruxakanafunexu.pdf
    • https://cdn.shopify.com/s/files/1/0441/4049/5000/files/kijarura.pdf
    • https://cdn.shopify.com/s/files/1/0433/7169/2188/files/lagu_kartonyono_medot_janji_cover_koplo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/23480185849.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee97749bb1d04e2f90c42d5872c6ea91.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_a694018b07fc4a9386b1c95f5cfaa371.pdf
    • https://cdn.shopify.com/s/files/1/0428/7778/0134/files/fusionner_fichier_word_et_excel_en.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6634/files/80563815194.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/duwolewademekisukov.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/34324816868.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/how_to_cite_unreported_cases.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_off00006e6e.bin
d42232d7fd190b60c0e41cd2abfa13a9587e8011bb40c47291adf5ca8ec1240c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6E 5456 bytes
font_01_sfnt_off000080d2.bin
437c6fa1325e99d37d9a0ca95092725282e300d46bbb79d4f379e6e7274dacf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D2 10316 bytes