Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f4a97c1834b740…

MALICIOUS

PDF

45.8 KB Created: 2020-08-04 23:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb5cefc60d7b42da386d9e0242ef07d SHA-1: f7520b0e8ed59651d0d254df1fb0d5fb9cf3c714 SHA-256: 61f4a97c1834b740437f6be5dacce5fedee7cd987b66db688365dcb7748b7456
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=go+math+grade+7+accelerated+answer+key+pdf', is identified as a malicious redirector. The presence of this malicious redirector, combined with the link farm, indicates an attempt to lure users to malicious infrastructure under the guise of providing an answer key. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=go+math+grade+7+accelerated+answer+key+pdf
    • http://files.preservationmathews.org/uploads/1/3/2/6/132681976/4587890.pdf
    • http://files.markdown-moms.com/uploads/1/3/1/3/131379306/bixujuna.pdf
    • http://files.laseraccents.com/uploads/1/3/2/6/132681201/444503.pdf
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://files.healthycleaningsolutions.com/uploads/1/3/0/7/130740033/juxiga_tadekijakatuki_fiwobovoweme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/84433237859.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/89139734276.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/50892565458.pdf
    • https://cdn.shopify.com/s/files/1/0438/5354/5632/files/60221147188.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/44804588740.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/suxusarujimixaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/8413685760.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/lg_tone_hbs_900_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/12766821821.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/sizobosonawepolulemoso.pdf
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/baxalerewolorol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/dudekozor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632d.bin
1c87c699ee7c78081900a2b3275f6e716f0505ad92e039067aa682844a8c77af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 5680 bytes
font_01_sfnt_off00007683.bin
546fc7ab669fe1b13478c21a87e289ac029a32f8c60cac5160c1ade26431410b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 10980 bytes
font_02_sfnt_off00009b94.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B94 4324 bytes

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