Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fea4af4a8dbbc4…

MALICIOUS

PDF

44.2 KB Created: 2020-08-23 16:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ea2953f5b2815eb832d808e4532d3d3 SHA-1: 12344381530687a35666e85ba2c102335b157ddf SHA-256: 67fea4af4a8dbbc483330e553b8f8284fe0e76e32d4a76b419c5560c8d508318
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/pify?keyword=add+alias+gmail+android' as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of numerous external links indicates an attempt to direct users to external, potentially harmful, content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=add+alias+gmail+android
    • http://files.citizenstoabolishredlightcameras.com/uploads/1/3/0/7/130775747/3609296.pdf
    • http://files.lemonteilrevolution.com/uploads/1/3/0/7/130739678/dabimikanupitiv_fegowojidomet_mixufudap_pasuf.pdf
    • http://files.stitchanddestroy.com/uploads/1/3/1/6/131637273/pitexemevawudural.pdf
    • http://files.madisonguebert.com/uploads/1/3/1/4/131453061/silebemupuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3474/6790/files/kunipuwexelajozotonez.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/astm_a106_grade_b_schedule_40.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/41562486035.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/linkedin_banner_size_2018_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/perisher_australia_snow_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/kagaxem.pdf
    • https://cdn.shopify.com/s/files/1/0439/0099/3704/files/lg_magic_remote_an-_mr600_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/zoology_honours_books.pdf
    • https://cdn.shopify.com/s/files/1/0449/5238/7739/files/velexaxibazovij.pdf
    • https://cdn.shopify.com/s/files/1/0451/3683/8821/files/astronomia_nova_keplero.pdf
    • https://cdn.shopify.com/s/files/1/0428/5785/7187/files/chemistry_past_papers_a_level.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_off00007018.bin
bd73731d6708075bbfaa35d1ce207823c44d08fd06b2afbaea6eab41793b130d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7018 5132 bytes
font_01_sfnt_off00008172.bin
6755dd304e19bf2a906f2459cebdaffdf86ffc0b50b07325b46c7fbdaaecc9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 10144 bytes

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