Malicious PDF — malware analysis report

Static analysis result for SHA-256 086237b73596bd1a…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364d30f94145853d0bede12aba3e7ea1 SHA-1: 54e7f0061b16572364487ba3f3534a68863db31f SHA-256: 086237b73596bd1a708588f267a13aa97bf419cec666368972ba5f470a28b3ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, identified as a PDF link farm. One of the primary links, https://ttraff.ru/pify?keyword=adressering+formele+brief+engels, is flagged as a known malicious redirector. The document's structure and the presence of numerous external links suggest an attempt to direct users to malicious or scam websites, likely as part of a phishing or SEO poisoning campaign.

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=adressering+formele+brief+engels
    • http://files.littlebobtailresort.com/uploads/1/3/0/7/130776407/3179864.pdf
    • http://files.adrianasamper.com/uploads/1/3/0/9/130969775/dipokepuwatuxid_sejotoguj_tazivotos_bosufas.pdf
    • http://files.silverfitnessct.com/uploads/1/3/1/3/131378990/juwaxijonirabufajus.pdf
    • http://files.infiniteaction.net/uploads/1/3/2/7/132712306/vosaka_pubemoxasonelob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/pstm_certificate_means_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/zamzar_online_to_word_converter.pdf
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/3963090283.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/lofose.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/83954775533.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/ccna_voice_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/mumosiketazepinoxoxovowoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/tekizugizuxupenewub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/feline_calicivirus_pada_kucing.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/rubisadowuzavapirujifa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e5.bin
af93bb679c4d6c2d5aad88bc2038ed8125909d525ac16aa3268e03a65f302f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E5 5148 bytes
font_01_sfnt_off0000824c.bin
9806a41c2c2899d068094ce27f9a9ff24823ae9b0abcca72c44b79d06e7bf949
pdf-font-stream PDF embedded font (sfnt) at offset 0x824C 10104 bytes