Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf782a5ccee3276…

MALICIOUS

PDF

38.7 KB Created: 2020-08-10 10:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d85e8f13dceab468ac79a185a8fb8f SHA-1: 3f2d278e1c3c3109319f0cc348a51128c71a256f SHA-256: 0bf782a5ccee3276499aef82ccc07b746658812fb5c07f27937390ae85293cc3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.cc/pify?keyword=exam+ref+70+764+administering+a+sql+database+infrastructure+pdf`. The document body, though partially obfuscated, also contains this URL, suggesting a lure to a malicious site disguised as a technical document. The presence of many external PDF links, some benign and some unknown, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads.

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=exam+ref+70+764+administering+a+sql+database+infrastructure+pdf
    • http://files.thecheltenhamastrologer.co.uk/uploads/1/3/1/4/131453198/rivuwejes.pdf
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • http://files.sweetnspicecandles.ca/uploads/1/3/2/7/132710676/9273107.pdf
    • http://files.junkremovalvegas.com/uploads/1/3/1/3/131381804/zotik_sapelomarir_juvoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/thermal_biosensors.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/mufazegagunuwalodugogut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/new_cutting_edge_elementary_teacher_s_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0475/6121/files/fotavekolosogoluxewewixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/econometric_methods.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/81151095381.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/72534181598.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/zebusizuwuxewapix.pdf
    • https://cdn.shopify.com/s/files/1/0437/0910/4279/files/sdgs_goals.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/akuntansi_keuangan_lanjutan_2_salemba_empat.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/12413519694.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/kawizavukenovugev.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_off00005723.bin
970b6aa98d67b56ca13037422fa1342864b7e197da380707f09938a31cb2f20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5723 6228 bytes
font_01_sfnt_off00006c44.bin
3a4bb1a9e4dfb175aecf1103959e7d122f6965f927ab3d3c18e902079a73e98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 9688 bytes

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