Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f987ba1c0afda6c…

MALICIOUS

PDF

53.3 KB Created: 2020-08-23 23:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84c6364b0d6097671bfa9f994e70800 SHA-1: 76748bb1dda47d5e43d71ae197eb73a9d7ad1391 SHA-256: 9f987ba1c0afda6c4bc65a70cf6b1d8480f1e443970236852edd4a6b5aa5e2c3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=movie+tv+series+apk'. This URL is presented within the document body, suggesting a lure to download potentially malicious content. The presence of a large number of embedded PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier also 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.ru/pify?keyword=movie+tv+series+apk
    • http://files.jp2waterloo.ca/uploads/1/3/1/6/131637723/zofolepuvideb_ralitatigezi_vibedadene.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://jidem.high5communicationresources.com/uploads/1/3/1/0/131070786/6377773.pdf
    • http://nidibuti.shotokankarate.net/uploads/1/3/0/8/130874429/nemekepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/strategic_advertising_campaigns.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2240/files/def_model_answer_2018.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/fizas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/wunubobenufusizugatefaju.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/credit_risk_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/sesugilow.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/sign_up_sheets_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/corsair_275r_build_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/zubimiluboruwumipuzufube.pdf
    • https://cdn.shopify.com/s/files/1/0429/1464/4127/files/fake_army_acceptance_letter.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dec.bin
2fe5dafed5be68153d49d60e447df59bdf9989dbc4b20dbd48418f1f7f5d7016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 4592 bytes
font_01_sfnt_off00008d9f.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9F 2092 bytes
font_02_sfnt_off00009740.bin
596238bbd1b29527f93b311a45c9df20353dafccee98b5d6e2757ec36d64aeee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9740 10196 bytes
font_03_sfnt_off0000ba28.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 4324 bytes

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