Malicious PDF — malware analysis report

Static analysis result for SHA-256 1395d1b080f1407a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 16:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b180e590ddc5c8d417fe4b1174211bc SHA-1: 86a3ac0862bf488594e2dc8d5d7a769cc9447bc0 SHA-256: 1395d1b080f1407a9d0bf07704780d2f0d602c35f483fe91df3b818e59a28000
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a malicious redirector at 'https://ttraff.cc/pify?keyword=amado+mio+sheet+music+pdf'. The document body, though partially corrupted, contains text suggesting it is a lure for sheet music, likely to disguise the malicious intent. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a compromised or malicious site, potentially for further exploitation or malware delivery.

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.cc/pify?keyword=amado+mio+sheet+music+pdf
    • http://files.iowaconcreteproductsandmonuments.com/uploads/1/3/1/3/131380786/pajajesa-namedekuv-pupuzivuvitul-nisutofuwuvezin.pdf
    • http://files.audiosolutionsplus.com/uploads/1/3/1/3/131383720/xakifuxuj_wozumajulotasol_kabis_fewinalepi.pdf
    • http://files.wiesbadenbaptist.com/uploads/1/3/1/6/131606526/10525542cf84de.pdf
    • http://nuwatoko.youngbrothersacademy.org/uploads/1/3/0/8/130874207/33dc51e678544.pdf
    • http://files.toymigos.com/uploads/1/3/1/8/131856381/61b8c1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/ark_behemoth_gate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/98695028997.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/36779971037.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1670/files/dixenirodiropobin.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/vebovej.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/biblia_de_estudio_thompson_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2735/6056/files/72385575354.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/26910457470.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4577/files/underline_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0437/0884/2152/files/79752772706.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/the_real_book_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/business_basics_student_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/twc_columbia_sc.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/wofoguz.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_off000051f4.bin
51cab999a86f28627d45025d3ea11c006f575e8968952af61b7a2d9ec6ba43da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F4 5256 bytes
font_01_sfnt_off000063b3.bin
ba2f37ba73c41062fd22677969fe82e18a81785060c8c22dca03512cf77cb884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 15184 bytes

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