Malicious PDF — malware analysis report

Static analysis result for SHA-256 b534a90184d08a2d…

MALICIOUS

PDF

62.4 KB Created: 2020-08-11 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103852be3e5e483eed9977220410251e SHA-1: f968b7fed6aa1bf8c265378e71973ae3764c1e24 SHA-256: b534a90184d08a2d1c685396ff485c44efd613595ba7edeb12156c3c9dfba733
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=abortus+adalah+pdf'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, with the first being 'https://cdn.shopify.com/s/files/1/0433/3443/4969/files/acquisitions_incorporated_download_free.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting a lure to a malicious site.

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.ru/pify?keyword=abortus+adalah+pdf
    • http://files.stswithunsprimary.org/uploads/1/3/2/7/132740338/bibanojedasutasul.pdf
    • http://files.erichotz-portfolio.com/uploads/1/3/1/4/131483147/mivunov-pifaxupije.pdf
    • http://files.melissa-field.com/uploads/1/3/0/8/130874379/9b24f.pdf
    • http://files.mtoliverunningtofeedthehungry.org/uploads/1/3/1/4/131453215/futovipet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/acquisitions_incorporated_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/63770504537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/vomoxexafesabutozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/black_s_law_dictionary_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/taber_s_cyclopedic_medical_dictionary_23rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/77380204841.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/4525741831.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/vikuzuvesog.pdf
    • https://cdn.shopify.com/s/files/1/0437/5075/2417/files/jiwezuxawow.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/english_syntactic_structures_aarts.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_off0000abc9.bin
27779c7bae6dbde28b727d907c4cc094de2e59ed480cb064a60c9e481a7530f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC9 4868 bytes
font_01_sfnt_off0000bc56.bin
bcec0a50b14c24377c4eaf38ad8eed315768849e33008ce7c182bda577b920d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 10028 bytes
font_02_sfnt_off0000dea8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 4324 bytes

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