Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09c92452ae56dd4…

MALICIOUS

PDF

34.3 KB Created: 2020-08-18 13:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d075a31f8a5f6643c88d6aff02b0879c SHA-1: f806356ca49a16009750d68ec1b7a4b72dbec368 SHA-256: b09c92452ae56dd48cc7f812be690da86957a4012d85a884f088ca4d8b876358
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One of the primary links directs to `https://ttraff.com/pify?keyword=autumn+season+word+search+pro+answers`, which is flagged as a malicious redirector. The document body, though corrupted, suggests a lure related to 'Autumn season word search pro answers'.

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=autumn+season+word+search+pro+answers
    • http://files.clydepartinmoncoinc.com/uploads/1/3/1/4/131437018/mutokotew.pdf
    • http://files.duffybookbinders.com/uploads/1/3/1/4/131437676/vugelelok.pdf
    • http://xelosu.unfadaptivetoyproject.com/uploads/1/3/1/6/131606066/jelulinajivupi_mesufisuvij.pdf
    • http://files.michellevanlare.com/uploads/1/3/0/9/130969603/jitisunagejekavob.pdf
    • http://files.highsierrasfrc.org/uploads/1/3/1/8/131871740/gatedosel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/zelekakopolegajasokonoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5023/files/logical_functions_in_excel_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/53934694894.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/chrome_remote_desktop_interrupted.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/brown_eyed_girl_guitar_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/birches_first_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0440/0247/6190/files/69344041695.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/xudogugeremelemisiwiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/5219/5230/files/analise_combinatoria_exercicios_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/29024058085.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_off00004856.bin
4be03867f5b4764783b44cc0793468fd672fced9a9dfbc35033fc3bfe1050f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4856 5360 bytes
font_01_sfnt_off00005a6c.bin
09108a65be7b125cfcbd7b059f29daac1fe513bd12eb7308d2597103de560b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6C 9892 bytes