Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471d09d7f7214f2…

MALICIOUS

PDF

72.8 KB Created: 2020-08-21 17:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4175dc98e3d99bdf72ab68970b38e74a SHA-1: 27f367f2d02f4a3b025de6cff8c381f5e058b9fe SHA-256: 6471d09d7f7214f25dfd35e9d87bf13767cf0c37ef12dac38c40f1aee30d60f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites. The presence of numerous links points towards a link farm or phishing campaign.

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.cc/pify?keyword=splatoon+2+spicy+calamari+inkantation
    • http://files.doorwaystoadventure.com/uploads/1/3/0/9/130969704/dawimijo.pdf
    • http://sotij.waynerichards.org/uploads/1/3/1/4/131453574/tifuwozixivibi.pdf
    • http://files.personalcheftony.com/uploads/1/3/0/7/130739621/piraxu.pdf
    • http://rakoj.friendsofkirkleyhall.org/uploads/1/3/2/3/132303382/nagere.pdf
    • http://files.aldersgatebutte.org/uploads/1/3/1/3/131379696/xomuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6224/5029/files/active_voice_rules.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/kosibegifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/accuweather_fayetteville_nc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/basidiomycota_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/72185444221.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/pifebugir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/86287509443.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/pros_and_cons_of_social_media.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/1468178686.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/wotakirafekaluvemube.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/44425566307.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/46659014811.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.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_off000099fa.bin
0543a07b5874686f3d5429741a5f666ddbbc9db53611fbd8c52c1b397613c7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FA 22044 bytes
font_01_sfnt_off0000dff3.bin
30e572f83a011f3cd7f9673a36e80b9b3476b84ee2111bfc16bf36fb80d12eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 5480 bytes
font_02_sfnt_off0000f280.bin
7ac7d8db2223a24d6f5603c690fa7ccd6958635498c995275bcc2ca68b48e1a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 10316 bytes

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