Malicious PDF — malware analysis report

Static analysis result for SHA-256 44953eb7988b3441…

MALICIOUS

PDF

55.7 KB Created: 2020-10-28 06:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 61dbd61da869409e928d63bfb0f6c5ee SHA-1: efc7f36e20eb7e4f64fd019951f54b7277a208c6 SHA-256: 44953eb7988b34417b0ffc45e612b1dd5d796a24b5e66fc55a738df035d9b5ee
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a product search, suggesting a phishing or scam lure. The PDF also contains a large number of external links, characteristic of a link farm, with the primary link pointing to a potentially malicious redirector.

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/123?keyword=harbor+freight+portable+gas+air+compressor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8f2ac3291da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f8ff5bf1f8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f90b3b59eece.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/mizopemodufezo.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/5261978.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/nawegawewojar.pdfIn 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/1/0479/1979/2294/files/hesi_a2_reading_comprehension_practice_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7855/7095/files/pronouns_worksheets_for_grade_6_cbse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2484/3420/files/65537121518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5863/8247/files/77927533913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8799/6085/files/california_school_holidays_2015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/5342944063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8207/9126/files/14395830877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/motorboating_merit_badge.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/41414437017.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/notomijonamonipitubif.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/atlas_of_medical_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/high_school_chemistry_book_free_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a9c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA9C8 23336 bytes
SHA-256: 81e81e3d6aaafddce07d6a93ac637d7ace10ec21c6c3bd48e521e3349a82b05c
font_00_sfnt_off00007437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 5528 bytes
SHA-256: 51be863a9390f0190a4802acb0bde25eef61b84091993fe6afbb13c674987baa
font_01_sfnt_off000086df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 10228 bytes
SHA-256: 7a3604fd20aef7d95da0989af44f91df8de1e1b8b9a9664c8edbfaaaf8337c63

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