Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c5b7d3c16add0…

MALICIOUS

PDF

35.2 KB Created: 2020-09-02 14:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee86cf5409e9695394b3e45a1e13be43 SHA-1: 1b7719a0160282359dbe67aebd58309b2170397c SHA-256: bd5c5b7d3c16add0ab280f341d224a3b980b7d2ffb34545f26b68697b93b5c04
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a "Watermelon template ppt". The PDF also contains a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious link. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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.me/wix?keyword=watermelon+template+ppt
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/factoring_quadratic_trinomials_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/89665223948.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/traditional_bowyer_s_bible_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/vozelukarawuzilatenanekeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/arabic_language_download.pdf
    • https://static.usrfiles.com/ugd/c3f59f_c3a05afbfe2d40dab8e4aae9113e1258.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba0567a109a46a6868974efd7aa2b5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c23ebc8e38c414986ed1c8f929ab5bd.pdf
    • https://static.usrfiles.com/ugd/ed64d2_6dde3f80659840e59c0f773414fd8413.pdf
    • https://static.usrfiles.com/ugd/b8c837_204a331194f440838d8c927d2a2c01f9.pdf
    • https://cdn.shopify.com/s/files/1/0431/8091/6893/files/cardiomegaly_in_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/38331019380.pdf
    • https://cdn.shopify.com/s/files/1/0439/3343/4011/files/archeage_leveling_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/76012663431.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3420/files/book_file.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_off00004c2f.bin
94245297c486d98a9f6bf445518b044966620ae86c43048db2aea5d9c9afc609
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2F 4800 bytes
font_01_sfnt_off00005c76.bin
cd7e9aa6bf98a714bef21f2b54cad09e43dbdcb3619564a65891e07ffb53ad4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 10580 bytes