Malicious PDF — malware analysis report

Static analysis result for SHA-256 35662035ef4bd365…

MALICIOUS

PDF

47.4 KB Created: 2020-08-24 15:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8211be72a1a373b90a06ec19abb063 SHA-1: 775ba8a692a52414ae53605f59e0ba62dd44f363 SHA-256: 35662035ef4bd365633f3ec8d09a8388ef880cb282ff08eae3bce83c459cc341
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the embedded URLs, https://ttraff.cc/pify?keyword=example+interview+answers+difficult+situation, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to interview questions, suggesting a potential social engineering lure. No scripts were extracted from this sample.

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.cc/pify?keyword=example+interview+answers+difficult+situation
    • http://dezufeme.paintingsbychrislwilliams.com/uploads/1/3/2/8/132815002/b0956e2c0e0b4.pdf
    • http://files.mymaryjanerehab.com/uploads/1/3/0/8/130815009/kodowowudes.pdf
    • http://files.milanibowhunting.com/uploads/1/3/2/6/132681865/fetijelajuzuzo.pdf
    • http://files.montevistalacrosse.com/uploads/1/3/1/3/131380626/afe1ce63c63.pdf
    • http://files.literateinaminute.com/uploads/1/3/0/9/130969545/pamoguruvedu_pewowame.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/pubidozuvux.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/69733022554.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/43384247758.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/43218938672.pdf
    • https://cdn.shopify.com/s/files/1/0464/6567/9512/files/90986458339.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/75974322228.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/kutejexit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1528/1568/files/face_deformity_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/astm_a536_grade_60_40_18.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/lepurofazasen.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/8343012483.pdf
    • https://cdn.shopify.com/s/files/1/0431/2426/1018/files/16248426107.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/third_law_of_thermodynamics_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/rupefirewuzexilena.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/ejemplos_de_bases_de_datos_en_mysql.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_off00007a0c.bin
e7a5d703ee07337a1827e03704855560008c885078a097ffab0bc41f5b22094e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0C 5480 bytes
font_01_sfnt_off00008cab.bin
4bf02627631c5fa9b96182097f19d0b7b2c8a3d2d6bef38a538baeb514501319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAB 10240 bytes

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