Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd3ee8ae27e1193…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 21:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9b67183520182439eb6a2c62dffb38 SHA-1: 32bf5df9e97c55ce1360be030d1039c2597c97e7 SHA-256: dcd3ee8ae27e1193fb9efa0141ee3df6fb286fdd00c444be31f8835033bab1ab
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link farm designed to redirect users to malicious infrastructure. One of the primary URLs, 'https://ttraff.ru/wix?keyword=%25C3%25A9valuation+nombres+jusqu%2527%25C3%25A0+9+999+cm1', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=%25C3%25A9valuation+nombres+jusqu%2527%25C3%25A0+9+999+cm1
    • https://static.usrfiles.com/ugd/b8c837_4d2c3bb36f12404e811aa3ac48835d09.pdf
    • https://static.usrfiles.com/ugd/4b874d_c4dec0bcdf794d20aab084d2a242b397.pdf
    • https://static.usrfiles.com/ugd/5360f8_0fe6d8545bdd4f7aad441a31f48c6330.pdf
    • https://static.usrfiles.com/ugd/b8c837_adcbfd0dd84c46919f0b95b7516ae856.pdf
    • https://static.usrfiles.com/ugd/ae059d_35f4e5c8088948b0b1abdf1c1c6f5a3e.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/67098063089.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/6420770428.pdf
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/love_shayari_good_night_image.pdf
    • https://cdn.shopify.com/s/files/1/0435/1626/4616/files/kizos.pdf
    • https://cdn.shopify.com/s/files/1/0454/2444/3548/files/11845464441.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/rihanna_unfaithful_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/62900310656.pdf
    • https://static.usrfiles.com/ugd/b8c837_96ca8690fda74c27bbbcaf388d325fc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fd49c83dee04e82a9ad8695ef5cdc45.pdf
    • https://static.usrfiles.com/ugd/34ec99_856db9ad573f437eba9b102672ccad45.pdf
    • https://static.usrfiles.com/ugd/0d089b_989f424b84d74a3bace2bf35fd9342ca.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_off00005b94.bin
37c6afa2e0f366228417fbb9295d9c223f4bbcfc1d467ca144ee815fac92c615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 5804 bytes
font_01_sfnt_off00006ec1.bin
0daa2daf302f2f5bb360477815adb9d76391593bb0bb3c98c6da1cde94be4045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC1 11656 bytes
font_02_sfnt_off000094b3.bin
8e6800903af266ba3acadd5a65ca2043ee31b804d7ee87e048bfe7f28fb5274b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B3 16360 bytes

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