Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81b8f81a2ec922d…

MALICIOUS

PDF

33.9 KB Created: 2020-09-14 05:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b82e3a3081829a00c5357741afc2972 SHA-1: d000e888ac3cda59254778117100ac96af5a81d9 SHA-256: b81b8f81a2ec922da21904528505c2249c1dc2bd92fad8796218d126cc993d75
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the heuristic PDF_SEO_LINK_FARM indicating a link farm designed to manipulate search engine results. One critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, specifically identifies a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.me/wix?keyword=mcpe+15.0+apk' is likely part of the malicious redirection chain.

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=mcpe+15.0+apk
    • http://files.hawaiicat.org/uploads/1/3/0/8/130874554/25817b3246.pdf
    • http://files.castcoverstasmania.com/uploads/1/3/0/7/130740260/74cd13a.pdf
    • http://files.chinookaircraftsales.com/uploads/1/3/1/4/131453267/weduluwemenus.pdf
    • http://files.northeasternwomensrugby.com/uploads/1/3/0/9/130969576/7706053.pdf
    • http://lumajeton.pennwriterswritingcontest.com/uploads/1/3/0/8/130814238/lodiwoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7926/files/salmon_fishing_washington_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/gardenline_chainsaw_sharpener_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1557/files/87895974320.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/3d_max_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2517/files/31340139535.pdf
    • https://cdn.shopify.com/s/files/1/0437/8696/1045/files/common_core_math_sheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/led_heat_sink_design_guide.pdf
    • https://static.usrfiles.com/ugd/e1d58f_49d17b6a232949a886eee865f23cc37e.pdf
    • https://static.usrfiles.com/ugd/87fdc7_ef0bb7307bac46a8953af3999c7fc232.pdf
    • https://static.usrfiles.com/ugd/f6a907_439fa4cbe68b455899d3fdf494c8f72d.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_off0000488a.bin
cd09a3d75d1f15142344c4f1d70967718849e6dd4215fe2e0a43f74332e06892
pdf-font-stream PDF embedded font (sfnt) at offset 0x488A 5040 bytes
font_01_sfnt_off000059ec.bin
d0d3242590ac8a1e68faa453a66ca0c077a9b546bf6fbac9249325941a396cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x59EC 9796 bytes