Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd58e1b27cd96f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 02:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48d13e6c769e1b72610c2709c355e4f4 SHA-1: 285b0c331e41cd1bcc1555793c44a068ee6f13a7 SHA-256: 69dd58e1b27cd96f8e633f09e76ccd72f4666ee3006a43c0783e27d1ba2afb12
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to potentially malicious redirectors or SEO link farms. The primary malicious link identified is `https://ttraff.com/pify?keyword=adding+and+subtracting+integers+practice+worksheet+pdf`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'adding and subtracting integers practice worksheet pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates 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.
  • 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.com/pify?keyword=adding+and+subtracting+integers+practice+worksheet+pdf
    • http://files.valuetrainsusa.com/uploads/1/3/1/6/131636825/740c75f538b0.pdf
    • http://files.superiormachineandfab.com/uploads/1/3/1/0/131069899/8351974.pdf
    • http://xojutux.bancroftcenterofchinesemedicine.com/uploads/1/3/1/4/131408024/5659613.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/psychological_assessment_by_kaplan.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/temikanugotadarimoxomeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/doa_setelah_membaca_surah_yasin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/repipigaporiboju.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/lomanulatesifesob.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/16672106165.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/kelivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/pefipite.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/cancer_de_mama_sinais_e_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/15283674618.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/aerated_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/the_causes_of_bantu_migration.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_off00005bf8.bin
359865f6cff52fc1d496f6844b613a484f279d8568a580780460fa8b2fc7d1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF8 5672 bytes
font_01_sfnt_off00006f4d.bin
848a961350f7a26e36577a7de7da6262f82c81045d5e53f2f07e49b2bfef3f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 13220 bytes

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