Malicious PDF — malware analysis report

Static analysis result for SHA-256 111299a18ac2cba0…

MALICIOUS

PDF

66.8 KB Created: 2020-08-04 19:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79f0b44ca74e9dce112d0f4b778bf1df SHA-1: 5de3f63764a2f3fe634da69001b7a2930c5b6f8d SHA-256: 111299a18ac2cba048a2cfdbcb9b5b4b19c73d7b38677913bbe2acb3f3b77049
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bin sachivalay old paper pdf with answer' and a URL that matches the malicious redirector. This suggests a phishing or scam attempt to direct users to malicious infrastructure.

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=bin+sachivalay+old+paper+pdf+with+answer
    • http://zexen.hilltopkidsbardwellpark.com/uploads/1/3/2/6/132695615/vufafonav_juvazopoda_xafotuxegefa_puxewuk.pdf
    • http://files.myqse.net/uploads/1/3/1/6/131637043/kozajosematewak.pdf
    • http://files.ghostinspectors.com/uploads/1/3/0/8/130813448/fegadovi-mobijubobijakap-regamofopin-bawemutaza.pdf
    • http://files.greendeckops.com/uploads/1/3/0/8/130814475/nonomafojur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/gojezadikikape.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/pitch_black_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/45000055915.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5967/files/curso_de_ingles_en_completo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/6560088967.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/loluboxowux.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/82377317590.pdf
    • https://cdn.shopify.com/s/files/1/0434/7691/0242/files/86614234729.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/7070503912.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0435/4804/9572/files/iphone_model_a1429.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5f7.bin
f8eef6236716db1c81a3115821b64e14ca59b1129f82ef0598dd585792de4ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F7 5548 bytes
font_01_sfnt_off0000b8ee.bin
8acdb886dfbed254dc070404673e2b5d0cec32a756b5b62d92608352d81ea3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 15224 bytes
font_02_sfnt_off0000e7f5.bin
bc9d133518941f041cda1c8718e2472003d4da34dbfa742e3922751444972331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16372 bytes

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