Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f5eb43b3d31065…

MALICIOUS

PDF

40.2 KB Created: 2020-08-18 15:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a7e85ada8ba1cbaa9afe6b426714cbd SHA-1: 86b633cd062525094f1339629873104f420f45cb SHA-256: 89f5eb43b3d3106546060d65fbd82615303793f0e5e6008c6fbaccd407d5f3c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/pify?keyword=reflexive+pronouns+and+emphatic+pronouns+exercises+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains fragments of URLs and text that suggest an attempt to disguise malicious links as legitimate content.

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=reflexive+pronouns+and+emphatic+pronouns+exercises+pdf
    • http://files.martinehrensvard.com/uploads/1/3/2/6/132695749/3309585.pdf
    • http://files.franklingearnh.com/uploads/1/3/1/3/131398117/a69f5e.pdf
    • http://files.shefunilax.com/uploads/1/3/0/8/130813692/3833999.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/24222532426.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/81318576172.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9970/files/analytical_method_transfer_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/medof.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/42567522863.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/coursera_r_programming_assignment_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/9103/3250/files/vuzemepoxukepelozaxob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0620/5857/files/catalogo_ikea_2020_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/nobobidamadakulil.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/bugogomov.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/attrape_coeur_salinger.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/zolujanurokafexuremuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/nuzoniwosarigut.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_off00005241.bin
1efc60c9992bf2b72f13193fa3acc2214f702b43a6beea52881f90c4333fb569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5241 5412 bytes
font_01_sfnt_off00006486.bin
4326ba1d6d5def96b1ed8196bfe95759e1bf533fbfddedea47faea271310909d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 9568 bytes
font_02_sfnt_off00008529.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8529 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.