Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc8c7a837156acf…

MALICIOUS

PDF

47.3 KB Created: 2020-08-09 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b08f42aab00eaa1e9734e6d3fc688b9 SHA-1: d894a03a2652e7ce3b02aef0d76c639fce7f9ac0 SHA-256: 7dc8c7a837156acf2022732a083db1bd1da6dbeaef541d86d31f29cf237e8390
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to link farms designed to manipulate search engine results. One prominent link, 'https://ttraff.cc/pify?keyword=100+common+interview+questions+and+answers+pdf', is identified as malicious redirector infrastructure. The document's primary purpose appears to be to drive traffic to this malicious URL, likely as part of a phishing or scam campaign.

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=100+common+interview+questions+and+answers+pdf
    • http://files.unlvasce.com/uploads/1/3/2/6/132681698/fexaliwezaro.pdf
    • http://files.sailingforhome.com/uploads/1/3/2/3/132303286/fibometufa-matim-viwunen.pdf
    • http://files.sdhmongchurch.com/uploads/1/3/2/6/132695714/6c9829f.pdf
    • http://files.infinitylivinglockets.com/uploads/1/3/0/7/130739052/8275547.pdf
    • http://files.teachabcenglish.com/uploads/1/3/2/6/132695387/602de1234d9f1b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/speech_writing_format_cbse_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0485/files/54999140592.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/35952628341.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/69400976455.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/html_document_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/autonomous_desk_won_t_go_up.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/93817469839.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/34673635905.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/36970654806.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/53178989146.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/kivaxipifibunesof.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/cause_and_effect_vocabulary.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000799c.bin
504b905bae5e429ec717f9e4ee51bd01a3e28455cc1b11592bb8e48d915d5886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 5648 bytes
font_01_sfnt_off00008cca.bin
aef8d7545a1e64eaa59a45f9f6f9cc731e528148c6774b29d0ead58bc93f1ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCA 10140 bytes

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