Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae8f5d2e57f718f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-23 02:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb6a964dc24591e3082012335c23fec6 SHA-1: 968175dabbdef53c1b32c73155b6e2978f92e6af SHA-256: eae8f5d2e57f718f529f325d4dbdde192c2bb9253118fb0b113b8ae24779389c
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/pify?keyword=best+android+mobile+games+2019`. This URL is embedded within the document body, which also contains text related to 'best android mobile games 2019', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on `cdn.shopify.com` and other domains. The ML classifier strongly flagged this PDF as malicious.

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=best+android+mobile+games+2019
    • http://kosezow.josephmbrown.com/uploads/1/3/1/0/131071164/b3c3d57017.pdf
    • http://novirujum.shaynesimmons.com/uploads/1/3/0/8/130814340/kadesol-jusadiw.pdf
    • http://bonutovi.christinebarath.com/uploads/1/3/0/8/130813059/kabowezuta_parikefabezum_padoka_gerera.pdf
    • http://zelak.montealea.org/uploads/1/3/2/7/132740623/a4567cde3ca4a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/xisewuramatitarotawokigof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5695/4518/files/ensayo_del_documental_antes_de_que_sea_tarde.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6102/files/belirapumajaselomoforu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/nudupoxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/xabezoxitadip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4804/1637/files/89143617368.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/loxakasafasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/apex_code_developer_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/role_of_national_interest_in_foreign_policy.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/dilezimepazano.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_off00006e72.bin
6227a230fb57eba337fcdd86b94ad92736c45ba86f69cd50ea4e854a196d574e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E72 5816 bytes
font_01_sfnt_off00008224.bin
41238c69fd2dded8c1290838b7af2df7166ba904d2b93f555512434341ac8a64
pdf-font-stream PDF embedded font (sfnt) at offset 0x8224 10128 bytes