Malicious PDF — malware analysis report

Static analysis result for SHA-256 7706153ce1c0b544…

MALICIOUS

PDF

35.6 KB Created: 2020-07-10 02:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a01076c8f8bae2e579e363183a3f9a7 SHA-1: 6e1724bc0b3a4a741b0222f219b966a6e1a0bbab SHA-256: 7706153ce1c0b544ff83680dc8cc38642f07bba4f76cba8ae1ed3edca374a510
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many of which point to disposable domains and appear to be part of a link farm designed to attract search engine traffic. One prominent URL, https://ttraff.com/wb?keyword=autocad%20civil%203d%202016%20essentials%20pdf%20free%20download, suggests a lure for downloading software. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/wb?keyword=autocad%20civil%203d%202016%20essentials%20pdf%20free%20download
    • http://files.brendanpmurphy.org/uploads/1/3/2/8/132814239/a0e95b7589a.pdf
    • http://files.rebeccakopec.com/uploads/1/3/1/6/131637333/3d324cddee86.pdf
    • http://files.fidom.net/uploads/1/3/1/3/131382320/nugozigasa_fabupoxos_sugasuk.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://files.davidmleephotography.com/uploads/1/3/0/7/130739549/aeb8feff236f.pdf
    • http://files.simpleeating.net/uploads/1/3/1/1/131164472/601048.pdf
    • http://files.peggycoots.com/uploads/1/3/1/6/131606631/c62f53a17dc8cb.pdf
    • http://files.sararosinsky.com/uploads/1/3/2/6/132695467/6777223.pdf
    • http://files.cessauctions.com/uploads/1/3/0/8/130814976/8979163.pdf
    • http://files.premierdancecary.com/uploads/1/3/0/8/130874582/dd1e1b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pidunatuji.files.wordpress.com/2020/06/tenapen.pdf
    • https://bigoxufogir.files.wordpress.com/2020/06/vasidazenelijobokolujata.pdf
    • https://vonewoxad.files.wordpress.com/2020/06/67481839814.pdf
    • https://pajefobipisa.files.wordpress.com/2020/06/80442115784.pdf
    • https://rotapofex.files.wordpress.com/2020/07/jivivikomumilodubosikup.pdf
    • https://zodizijemas.files.wordpress.com/2020/06/49722610966.pdf
    • https://fajetiw.files.wordpress.com/2020/06/pabalitapofidulegatuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.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_off00004cfa.bin
cbe99f49ba242b956e15f37be20a0cd2ffd415b37cab2f21a6d798acd2a4ec0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFA 5816 bytes
font_01_sfnt_off000060d7.bin
f6420dd1e300e0f376093e8852c76799b48aaa95a9fe0fb2f0773f442bd1bade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 9408 bytes

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