Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d6fbe565b4cefa…

MALICIOUS

PDF

70.3 KB Created: 2020-09-05 20:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e89f3c720df4ed2b1b1bd83518effab SHA-1: 2aab0be702d2639a43cd79314358266773007a32 SHA-256: d8d6fbe565b4cefadb6acf12b5a7dd4933d212941f78cf775c047d4341cde21c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to a URL that is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains text related to 'myeconlab answers to quizzes' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a large number of external PDF links also indicates a link farm, potentially for SEO manipulation or distributing further malicious content.

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.link/pify?keyword=myeconlab+answers+to+quizzes In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/black_hole_sun_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/84743177267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/45199230675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/cccam_info_enigma2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/kant_aufklrung.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/witcher_3_yennefer_nude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/auto_transformer_method_of_starting_induction_motor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/fountain_lake_albert_lea_fishing_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/judicial_internship_interview_questions_and_answers.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_60555049390642529381efb17e044f90.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4b68be_a8afa0a0b2fb4cfe8f027cb392d17f5c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_351a181d98fa4a3eb7301eebd9f2f107.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/906e9f_199d13f886f24a34833b7434f495c904.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8127dd_548f901ef9a74ba28d6d48a3e03aadbc.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA1 22524 bytes
SHA-256: a0c6421b655794d7cbb98dc9e6504d40c23b4fa703a89e0d5957eb9bd7fb7333
font_01_sfnt_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 5308 bytes
SHA-256: 3d3622ddaa7eefeef321b27e15be6724be5120733a0dd661d19a4d57d99707b9
font_02_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 11260 bytes
SHA-256: b95785fa4bd6994c18ee48d3f019f70687b6768ea1092c543ddffec8bc972e4b

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