Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcad6315c90dc93…

MALICIOUS

PDF

45.2 KB Created: 2020-09-02 10:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba97eb33eba3a53b546520590c8b51ae SHA-1: 91bc877fae77a66bc509ca49445403de47274ae3 SHA-256: 7fcad6315c90dc932de7686d6480c6cf342fc05a71692c73392470088a1b4f73
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for 'open office free windows'. This redirector likely leads to further malicious content or downloads. The PDF also contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or malware distribution attempt.

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.link/wix?keyword=open+office++free+windows
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1be480_7e797f09712642b4b00a68416064b445.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_6b41bc6927ac4363b88f3233aff51637.pdf
    • https://static.usrfiles.com/ugd/493135_3b4c3df5a6c34b949f090e8263c5ba8e.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/guvidovalebavesemenaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7734/files/vebosikujinenu.pdf
    • https://cdn.shopify.com/s/files/1/0465/1991/0558/files/crimson_dawn_of_peace_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/tuvolopoguf.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1910/files/molar_concentration_of_solutions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/behavioral_addiction_screening_assessment_and_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/businessman_naa_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/cdl_self_certification_form_illinois.pdf
    • https://static.usrfiles.com/ugd/784815_3817a206e39a49e38c28640ea87c2eb5.pdf
    • https://static.usrfiles.com/ugd/d775a9_89ab5ab419e14948bc1c000c038ab819.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_off0000738d.bin
d3e67ed1dcea7af554daaa293da0fe42e7bbb29d68e35052b3bdfb4fd230c55e
pdf-font-stream PDF embedded font (sfnt) at offset 0x738D 5024 bytes
font_01_sfnt_off000084cf.bin
cbe2cdefdf3951d49b4a003e900171957838517dbeff1c536463f385223163ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x84CF 10388 bytes