Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc08aee3ba374e8b…

MALICIOUS

PDF

40.0 KB Created: 2020-09-04 22:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 374be3f148a988b0839a8a1044950821 SHA-1: f4dd93cfd773211069c832fa31b6c2edcab9ca90 SHA-256: dc08aee3ba374e8b6535bbd58b59b9ddb58e43592abe1ffcd2e38ba12ba5b930
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are part of a link farm designed to improve search engine ranking. One prominent link, disguised as a current affairs PDF, leads to a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a deceptive purpose.

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/pify?keyword=adda+247+june+2019+current+affairs+pdf
    • https://static.usrfiles.com/ugd/754d94_6e773640499b44f9a0e55ce3106d558f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ec84b551244b7a8abb88feec3d9f0.pdf
    • https://static.usrfiles.com/ugd/69695d_a248f03467a7425ebc876cb791ab0ea8.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/versacheck_download_with_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/pabutefik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/fn_baby_browning_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/98737039550.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/gevujinimukedit.pdf
    • https://cdn.shopify.com/s/files/1/0465/4176/6814/files/aprendizaje_significativo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7176/5656/files/assassin_s_creed_origins_official_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/51800768627.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_off00004ff0.bin
f37d67d29cb235c4549cac87f2d05b5ab5f8393ed3eedfd2727cc57d71289b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF0 5604 bytes
font_01_sfnt_off00006326.bin
6aafb24f55d1a8e5648a33b74b630f26b8bc747718c24e56dc30b474195cb027
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 10012 bytes
font_02_sfnt_off00008564.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8564 4324 bytes