Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f18ba96e3284bb…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 07:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59f08547db2b8be1c0988fe81c7a76a SHA-1: 0d3e8cbecf23998a1ed9d54934a2351e77f5f733 SHA-256: 98f18ba96e3284bba5aa77e323cc93a0af0473c3b057e090974745636adc6f48
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Big ideas math answers algebra 2' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of multiple Shopify links, some benign and some potentially malicious, indicates a link farm strategy to improve SEO and distribute malicious content.

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.com/pify?keyword=big+ideas+math+answers+algebra+2
    • http://movexi.unitedchurchofhuntington.com/uploads/1/3/0/8/130874038/1443218.pdf
    • http://jepilasu.aframstoryretreat.org/uploads/1/3/1/4/131406515/topufisew.pdf
    • http://files.theaccountantthatlovestech.com/uploads/1/3/0/7/130740077/b3710930.pdf
    • http://files.longviewarcsociety.com/uploads/1/3/0/9/130969895/kiridomu_gojawog_faxuwadedu.pdf
    • https://cdn.shopify.com/s/files/1/0457/5248/3996/files/platform_king_bed_frame_canada.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/zarchiver_apk_mirror._net.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/ximovotofugatinarefanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/zabotijotegazubitawewabif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/74503413737.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/ridogifesofolexosokujix.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/38475881007.pdf
    • https://cdn.shopify.com/s/files/1/0432/7053/7374/files/81190274479.pdf
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/tojepitafizebupije.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0951/files/kaththi_villain_bgm_free.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000543e.bin
ac79303487aab6fadcad133a7fe00a924dfbfd8d16fbca5d7cd5394a8f392bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543E 5332 bytes
font_01_sfnt_off00006639.bin
4fbb611aaac06f4a89429cc57509c26f42d68f66d65d6f6e3151056f53b6c4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6639 10140 bytes
font_02_sfnt_off000088f3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F3 4324 bytes

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