Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b88f90095ab991…

MALICIOUS

PDF

51.4 KB Created: 2020-08-20 23:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16507d479117d245893f251e6db3df5 SHA-1: e0450053b3aa7bb702e18e5d3337143e31747024 SHA-256: a2b88f90095ab991485a1b09a66ac0ce31cfb8030ef045106fe84874c5b2a5fe
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Comprehension worksheets for grade 3 printable' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also hosts a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, likely for SEO manipulation or to distribute 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.com/pify?keyword=comprehension+worksheets+for+grade+3+printable
    • http://files.fabiogrillo.com/uploads/1/3/1/3/131384424/dajanemibubupefis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/hiibboo_afaan_oromoo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/77891812737.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/renifokikivexibat.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/sokileb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6681/files/titopasaruzeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/amelie_piano_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/9234/2939/files/port_huron_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/96960695325.pdf
    • https://cdn.shopify.com/s/files/1/0440/7564/7128/files/dalafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7052/0470/files/96525080249.pdf
    • https://cdn.shopify.com/s/files/1/0430/4132/5207/files/dogab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/building_construction_specification_uk.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/dagofivube.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1655/files/duchess_of_malfi_as_a_revenge_tragedy.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_off000089f3.bin
8bcc9047d6b410722c53e3e8933e64dd64a7483977a922bffbe9fd11ebc4dfcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x89F3 5820 bytes
font_01_sfnt_off00009da7.bin
145ec467373127279c3d0d2e5ebe55192ac1cbf94bb6202cb0208ba9af02bcc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA7 10096 bytes