Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f477cc3f45f8d8…

MALICIOUS

PDF

63.9 KB Created: 2020-08-08 02:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb29f85f07ea4c920388059ee1f2ff7 SHA-1: d44e44e43e7a0b3d01b8a8a7899d26ad3a206be7 SHA-256: a8f477cc3f45f8d8598c1a2b150a57f324fbca7612b69e6f088e8c2231998a6e
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'interview questions' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are likely part of a link farm designed to improve search engine ranking for malicious 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.cc/pify?keyword=ece+interview+questions+and+answers+for+freshers+pdf
    • http://files.scillycottage.com/uploads/1/3/0/8/130874201/rumekolerobanidubiz.pdf
    • http://files.exoticfashion.online/uploads/1/3/1/8/131871778/3a07556bf40.pdf
    • http://files.thealbertafloodroseproject.com/uploads/1/3/0/9/130969555/13cd00738d.pdf
    • http://files.scillycottage.com/uploads/1/3/0/8/130874201/rumekolerobani
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/abelian_group_properties.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/14490327364.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/itext_add_png_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/41564681199.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/9839186239.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/3066847506.pdf
    • https://cdn.shopify.com/s/files/1/0434/7114/3078/files/17530992016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/lokudusibimewusuvagob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/66826092524.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/83978447988.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/ncert_class_9_beehive_solutions_download.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_off0000bbe5.bin
11f3f97557c6492f6ecb3b3887f835c73cbcc812d9eac5678ce8bf27d0810a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE5 5444 bytes
font_01_sfnt_off0000ce82.bin
a4a2d3134b8654cd018be8c6f4a3d1a4ac1de2776a1732586643e29af6bee056
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 10460 bytes