Malicious PDF — malware analysis report

Static analysis result for SHA-256 55468a29dd3c03c1…

MALICIOUS

PDF

70.9 KB Created: 2020-09-01 13:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd09775c000c2f61b485cc138baa1630 SHA-1: c27da77567ae6bfe1240036460da6e9864fdfb6e SHA-256: 55468a29dd3c03c129c7282660121bb95210d1bf659696e9664b8afd19259776
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the presence of a 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.link/wix?keyword=sites+to++hip+hop+albums
    • https://static.usrfiles.com/ugd/93c935_5f92b560a0154118929eed2d506e4107.pdf
    • https://static.usrfiles.com/ugd/e2f197_dbf167f55775456188828fb332988c43.pdf
    • https://static.usrfiles.com/ugd/defcb2_7f30d95dbc3f46409b00ab659b3a31d7.pdf
    • https://static.usrfiles.com/ugd/a86d68_451263078934465ab06df5cfcf2d0d92.pdf
    • https://static.usrfiles.com/ugd/77941b_2cebb738ed5d46b1972583a78f7cf3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0a6355140284d5ea78165582bcba1ee.pdf
    • https://static.usrfiles.com/ugd/eed56f_86747762dc594d96ad0226ba68be3e06.pdf
    • https://static.usrfiles.com/ugd/696b8a_fe33c23468104e7cae2f24d05f5afe02.pdf
    • https://static.usrfiles.com/ugd/f65518_d71e69d0d9ad4b849eb93c21927ff439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/83424159566.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/vusijojitiziwavelogusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/miposemirisakebufolit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c036.bin
df798dcf8b4589817b8155780035027b6b5467bef8996b66cb88850db4027b01
pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 5204 bytes
font_01_sfnt_off0000d1bc.bin
179538712f188f480111fe0c5c0bfd3ee043cb1614da01b02433b319265c80d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 12616 bytes
font_02_sfnt_off0000fa32.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16060 bytes